Journal of Modern Physics, 2011, 2, 519-532
doi:10.4236/jmp.2011.26061 Published Online June 2011 (http://www.SciRP.org/journal/jmp)
Copyright © 2011 SciRes. JMP
Entropy and Irreversibility in Classical and
Quantum Mechanics
V. A. Antonov1, Boris P. Kondratyev1,2
1Main (Pulkovo) Astronomical Observatory, Saint Petersburg, Russia
2Udmurt State University, Izhevsk, Russia
E-mail:kond@uni.udm.ru
Received March 3, 2011; revised April 24, 2011; accepted May 12, 2011
Abstract
Review of the irreversibility problem in modern physics with new researches is given. Some characteristics
of the Markov chains are specified and the important property of monotonicity of a probability is formulated.
Using one thin inequality, the behavior of relative entropy in the classical case is considered. Further we pass
to studying of the irreversibility phenomena in quantum problems. By new method is received the Lindblad’s
equation and its physical essence is explained. Deep analogy between the classical Markov processes and
development described by the Lindblad’s equation is conducted. Using method of comparison of the Lind-
blad’s equation with the linear Langevin equation we receive a system of differential equations, which are
more general, than the Caldeira-Leggett equation. Here we consider quantum systems without inverse influ-
ence on a surrounding background with high temperature. Quantum diffusion of a single particle is consid-
ered and possible ways of the permission of the Schrödinger’s cat paradox and the role of an external world
for the phenomena with quantum irreversibility are discussed. In spite of previous opinion we conclude that
in the equilibrium environment is not necessary to postulate the processes with collapses of wave functions.
Besides, we draw attention to the fact that the Heisenberg’s uncertainty relation does not always mean the
restriction is usually the product of the average values of commuting variables. At last, some prospects in the
problem of quantum irreversibility are discussed.
Keywords: Markov Chains, Irreversibility in Classical and Quantum Mechanics, Lindblad Equation,
Caldeira-Leggett Equation, Quantum Diffusion, Schrödinger’s Cat Paradox, Heisenberg’s
Uncertainty Relation, Collapse of Wave Function, Effect of Sokolov
1. Introduction
The concept of irreversible changes in physics is mani-
fold. First of all, it means a tendency to thermodynamic
balance, but the irreversibility problem isn’t settled by it.
In particular, in modern physics the important role plays
an irreversible mixing (or collapses of wave functions) of
quantum measurements results. Quantitative measure of
an irreversibility is the entropy and connected with it
characteristics. Some questions about dissipative quan-
tum systems were considered in [1]. From our point of
view, in this sort of questions many doubtful interpreta-
tions have collected; therefore in the given work we dis-
cuss debatable moments.
In Section 2 some properties of the Markov chains are
specified and important property of the probability be-
havior to monotony is formulated. Using one thin ine-
quality, in Section 3 behavior of the relative entropy in
classical case is considered. Further we pass to studying
of the irreversibility phenomena in quantum problems. In
Section 4 by new method we receive the Lindblad’s
equation for density function, and for the first time a
physical substantiation to this equation is given. In the
same place a deep analogy between the classical Markov
processes and development described by the Lindblad
equation is given. In Section 5 using the method of
comparison of the Lindblad equation with the classical
linear Langevin equation we receive a system of differ-
ential equations, which are more general, than the Cal-
deira-Leggett equation. Further we consider quantum
systems without return influence on a surrounding back-
ground. In Section 7 the quantum diffusion of a single
520 V. A. ANTONOV ET AL.
particle is considered. Possible ways of the permission of
the Schrödinger’s cat paradox are discussed in Section 8.
Then the role of an external world for the phenomena
with quantum irreversibility is considered. In Section 10
we conclude that in the equilibrium environment is not
necessary to postulate the processes with collapse of the
wave functions. In Section 11 ones draw attention to the
fact that the Heisenberg’s uncertainty relation does not
always mean the restriction is usually the product of the
average values of commuting variables. At last, in Sec-
tion 12 we discuss some prospects in the problem of
quantum irreversibility.
2. Some New Remarks on the Markov
Processes
In the formulation of rules of asymptotic behavior of the
Markov chains not to do without the condition, intui-
tively enough transparent, which we for brevity name
here a connectivity condition. Its essence—in the impos-
sibility assumption to break set of conditions into two
nonempty subsets I and II so that transitions from I in II
were absent, that is that all corresponding transitive
probabilities ij are vanished. Subject to the condition
of connection are only two possible types of asymptotic
behavior: 1) or for any initial distribution is obtained in
the limit—either directly or in sense of the Fejer arith-
metic mean—the same final steady—state distribution
(reservation is needed about the arithmetic mean for the
sake of a few exceptional cases, a periodic or almost pe-
riodic behavior in the limit ); 2) or also for any
initial distribution all tend to zero, the scattering
takes place at infinity.
p

i
Pt

i
Pt
At finite number of states there is, of course, only the
first opportunity.
The property of monotony formulated above can't be
found in known managements on the Markov processes,
see, for example, [2-6]. It can be considered as quantita-
tive expression of an asymptotics in the case 1).
At transition to continuous time a basis of the Markov
theory processes remains, but possibility of aforemen-
tioned recurrence disappears; but there are complications
of type of distinction “simply Markov” and “strict Mar-
kov” properties, occurrences of singularities for final
time etc., that, however, has not enough relation to the
discussed theme. At continuity of transitions in space of
conditions diffusive process (for example, in one-di-
mensional case) is received
 
2
2
1,
2
faf Df
tx x
 
 
 (1)
where
ax and —factors accordingly regular
displacement and diffusion. For the process (1) monot-
ony of the relative entropy (see lower) is easily proved
directly. For the Markov chains, symmetric or led by that,
the proof (1) is in essence given in [5].

Dx
In symmetric case at final the equiprobability n
12
1
n
PPP n
 (the condition of connectivity en-
tered above here is supposed) is limit, and at infinite n
unlimited dispersion turns out . The symmetric
variant of the diffusive process (1) is
0
i
P

1,
2
f
f
Dx
tx x
 
 

(2)
and besides there is the limiting uniform distribution, if
the boundaries are entered from both parties obviously
(with a condition not disappearances of the particles
0
f
x
on them) or indirectly, through vanishing
Dx
on final distance. For absence of the boundaries there is
dispersion on infinity.
3. The Relative Entropy in Classical
Problems
Let’s begin with random processes without feedback for
which typical example are the classical Markov chains,
having numerous applications in physics. The basic equ-
ation of such chains with final number of the condi-
tions is [2,3]
N
 
1
1
,
N
mm
j
i
i
PP
ij
p
m
(3)
m—number of discrete step, indexes i and j number the
conditions, i—probability of stay of system in the con-
dition i, and ij —the conditional probability of transi-
tion The obvious conditions should be satisfied
P
j
p
.i
1
0,1(under any );
N
ii
i
PP

(4)
1
0, 1.
N
ij ij
j
pp
(5)
For the system (3) should be the stationary solution
i
Q
1
N
j
iij
j
QQ
p (6)
with the same restrictions (5). On the each step it is possi-
ble to form the function of real variables
N1


12
11
,,, i
NN
m
mNii
ii
.
i
F
PQe
 

 

(7)
The minimum of this function is in the usual way at
 
0,ln .
i
m
mi
iii i
P
PQe Q
 
Copyright © 2011 SciRes. JMP
V. A. ANTONOV ET AL.
521
It is equal
  
11
minln1 ,
m
NN
mm
im
mi i
ii
i
P
F
PP
Q

 

S
(8)
where is the relative entropy
m
S
 
1
ln .
m
Nmi
mi
ii
P
SP
Q

(9)
Let's prove that the sequence monotonously in-
creases. From (3) and (7) follows
m
S

1
11 1
e.
i
NN N
m
mijji
ij i
FPp
i
Q
 
 
 (10)
Enter the indications
1
,
N
j
iji
i
p

then

1
11
e.
j
NN
m
mjj j
jj
FPQ

 

(11)
As the exponential belongs to number of the convex
functions, taking into account (5) from the Jensen’s ine-
quality follows [7]
1
ee.
j
j
ij
i
p
(12)
From the equality (7) and the relation (8) we obtain

1
1
11
1i
NN
m
mii i
ii
SPe,Q

 

(13)
where the last member is estimated by means of (12) and
(6):
111 1
ee
jii
NNN N
iijj
jji i
QpQ
e
i
Q.
 

 
So, after comparison with (11), from (13) we have
11
1,
mmN
SF ,


where, in particular, the parameters
can be chosen so
that they minimized the right part. Then
1,
m
SS
m
(14)
as was to be shown.
Exact equality in (14) is reached in the stationary state
ii
. (By the way , thus in general case PQ
0S
0S
).
Limiting relation

lim m
ii
mPQ

can be broken only in special cases of disintegration of
set conditions on subsets, the transitions between which
are absent.
Let's underline that the monotonous change of the rel-
ative entropy doesn’t contradict possible sometimes to
reduction of the usual (absolute) entropy
1
ln .
N
i
i
SP

i
P (15)
The typical example is the diffusion of relatively
heavy molecules in gas in the presence of cold wall. The
molecules are eventually collected on this wall and the
final distribution takes a form of the Dirac
Q
-
function—this is clear example of reducing of the en-
tropy. Physically, it is obvious that the case is character-
ized by increase in the total entropy in the transfer of
heat from the gas to the cold wall. Similarly, a massive
test body (for example, globular stellar cluster) moving
in the galaxy is experiencing dynamic friction [8] and
eventually up to some fluctuations, gradually settles to its
center.
The relative entropy coincides with the absolute en-
tropy at the independence of an index, i.e. when
i
Q
1,
i
QN
for which enough (but it is not necessary) that
there was symmetry of stochastic process: .
ij ji
pp
4. Irreversibility in the Quantum Case
The irreversible processes in quantum mechanics can be
studied either by setting a probability distribution for
parameters of the wave function (in the case of pure
states), or in terms of the density function (the states are
mixed). However, in both cases, the irreversibility mani-
fests itself only in the interaction of a quantum system
with exterior reservoir or bath. The wave function of a
dedicated system, in principle, refused to serve when you
can not ignore its inverse effect on the surrounding
background—i.e. when takes place a link, or entangle-
ment of states of the system and the thermostat [9]. Re-
garding the density function believe that it is sufficient to
completely describe a single system (as indicated below,
also gave rise to some doubts), but it certainly is not
enough when there are many individual systems in the
general context [10].
Let’s start with the density function .
Lindblad [11]
derived the most general law of evolution
,t
com-
patible with conservation of normalization, positive defi-
niteness of the function, the lack of aftereffects (and
some of the requirements of continuity and uniqueness).
Should be


1
,2
n
vvv
v
i,
H
LLL LLL
t



 
(16)
where
j
L—any operators, H—the Hermit operator.
(That circumstance that in (3) time was discrete, doesn't
Copyright © 2011 SciRes. JMP
V. A. ANTONOV ET AL.
Copyright © 2011 SciRes. JMP
522
t
play an essential role).
But Lindblad hasn’t given a physical substantiation to
the Equation (16). We eliminate this omission and will
make this as follows.
Let the chosen object interacts from time to time dur-
ing a short interval 0t
 with external field mak-
ing a part of the background and before not dependent on
given object. Actually, it is the Boltzmann scheme,
which though was studied earlier at quantum level, but
only at private assumptions [12,13]. To derive Equation
(16), we apply the general scheme. At the moment 0t
there is a need to use the new density matrix
as a
direct product of the density matrix
and the density
matrix of external field. For simplicity, assume that 1
has dimension . In diagonal form, hence,
22

1
1121
2
0
0, 0,0,1.
0




 2
(17)
Accordingly,

has a usual form

1
2
0
0.
0





For the Hamiltonian operating all system on interval
0, ,t
we take as much as possible general form
11 12
21 12
21 22
,.
HH
HH
HH




H
(18)
Then
 
e0e
iH tiH t
t.
 

(19)
Expansion on powers of t
do up to second order
terms
  
  
2
22
2
000
2000
2
it
tHH
tHHH H
 

 

(20)
After interaction stopping, by the general rule it is nec-
essary to take “trace”
t
and to return to former
dimension for
.t
As a result, with the same accu-
racy we obtain
     
23
2
1
000
2
iH tiH t
kkkk kk
k
t
teeLLLLLL

 

 

20,
(21)
where mm
of the matrix
instead of (22) appears broader

111222
1121122
2121
3212
,
,
,
.
HHH
LHH
LH
LH




(22)
set of the operators


,,
,1 .
kiiikkik
ki
H
HH
Hikm
 
  (23)
The two-level system concerns to number of the sim-
plest examples. It is convenient to consider
as com-
bination from a scalar part and the Pauli matrix accepted
further for the coordinate unit vectors. Then
it is
possible to write down as
0,
, similarly in the vector
form undertake H and L (their scalar parts don’t give the
contribution). Obviously, 0
remains, and
evolves
according to (15) under the law
Let us imagine now that the whole process of evolu-
tion has described the same type of interactions. The
background for this is stationary, but, generally speaking,
with the internal nonequilibrium (anisotropy of the tem-
perature, etc.). It is easy to see that the return of (21) to a
continuous smoothed time results with the same accuracy

2
t
to the Lindblad Equation (16). In larger dimension



0
12.i
t

 
H (24)
In particular, if to consider
and
as small
one order, and 0,H in the right part (16) the second
member prevails, and it can be oriented, for example,
both in a direction
, and in the opposite. As a result,
can both to increase, and to decrease. Accordingly,
entropy as the density function equal in this case
S
 
0000
lnlnln ,SSp
 
 
 
(25)
V. A. ANTONOV ET AL.
523
also can change in any party.
Pulè [14] gives the evolution equation, very similar to
(24) and essentially equivalent to it, as he also high-
lighted and a systematic component, similar to the first
two terms on the right side (24), and “damped” compo-
nent, similar the last two terms we have in (24). This
correspon-dence is observed, despite the private nature
of the model in [14].
Thus, there are foundations to consider (16) in general
analog of the classical stochastic equation of evolution
(1).
The analogy between the quantum process of type (21)
and the classical Markov chains is represented to us ra-
ther deep. First of all, for bounded n always there is a
decision of the Equation (21). Really, at any initial posi-
tively defined the arithmetic mean

0
 
0
1d
T
g
T
T
tt (26)
preserves properties of positive definiteness and the unit
trace, and consequently, the uniformly regular bounded
elements. Moreover, if denote by A superoperator on the
right side (21), that
  
0
0
1dd
d
TT
Ag t
Tt T


(27)
tends to zero, and thus, in the limit of at least some in-
creasing sequence of values of T is obtained the steady-
state solution (21).
Use of the logarithmic function of the matrices in this
context is formally inconvenient. Instead of, it can make
the quadratic measure of closeness, which varies mono-
tonically. Let’s present the stationary matrix B
to
diagonal form:
1
2
00
00
.
....
00 n
b
b
B
b




(28)
Similarly, the elements of any density matrix
t
we will designate as ik
. We define the functional

2
,
2
ik
ik ik
wbb
1. (29)
Term (–1) in (29) is introduced only to the particular
case B
to have . For 0w

w
we will make
the variational definition which is simultaneously a gen-
eralization on any choice of basis,

max 21,wSpB


(30)
where the maximum undertakes on any Hermit matrixes
of the same dimension .nn
For check it is varied
the functional in the right part (30), replacing
on

. A corresponding increment is opened as

2
2.
2
SpBB B
BB
SpSp B
  

 
 







(31)
If concretely to choose the matrix
with elements
2,
ik
ik ik
bb
(32)
then the matrix 2
B
NB
 is zero and in the
right part (31) remains the last, negative or zero, mem-
ber. So, the maximum in (29) is reached at a choice of
elements
according to (32). Simple calculation
shows that the magnitude of this maximum coincides
with (30).
The proof of monotony for it is enough to
give for the elementary case

wt
2LLLLL L
t
 
.
 
(33)
In (33) we uncover dependence
and from a B
time according to (19), though actually d
d
B
t0. De-
pendence
on a time can be at first arbitrary if only
the admissible set of Hermit
was saved. Concretely,
we assume
2LLLLL L
t
.
 


(34)
Then, in particular,


ddd
ddd
22
0,
Sp Sp
ttt
SpL LLL LLL

 
 
 





B
(35)
and it is easy to be convinced by a rule of circular per-
mutation. Analogously after differentiation
in
each term it is done such circular permutation that matrix
has appeared at centre fivefold product. As a result,
B



*
d22,,
dSpBSpL BL
t
 
0.
 (36)
Let in instant tt
matrix
Bt t

t
is selected so
that to maximize a track in (36). Then, in the moment,
has just been proved, the matrix associated with
the previous equation (36), the value of the track must be
more
t1wt
 . This will not be, gener-
ally speaking, maximized, but when taking the maximum

t
Copyright © 2011 SciRes. JMP
524 V. A. ANTONOV ET AL.
the inequality will only intensify:


,wt wtt


(37)
as was to be shown.
In deciding whether the standard solution is nonde-
generate, i.e ., whether it has full rank , again shows
the analogy with the Markov chains: degeneration occurs
only at infraction of the connectivity condition. We set
off such violation, when at suitable unitary transforma-
tion, common for all v, it is possible to select two
nonempty groups of states I and II so that in all
transitions
n
L
v
L
I
II miss.
For the demonstration we will result again the station-
ary matrix in diagonal form. If, in former labels,
B
01 ,
i
bisn
but
, it is com-
10
sn
bbs
 
puted in d
dt
B the diagonal elements with i, that
gives
s
2
11
d
d
Ns v
iik
vk
bl
t
 (38)
( - elements of matrixv). The requirement of sta-
tionarity is fulfilled, only if all ik
l with
v
ik
l L
,isks
are vanished, and this means precisely disintegration of
set of states on two groups.
At performance of the connectivity condition also eas-
ily proved that is aimed to a stationary state at
least at terminating . Really, let’s will look, when

t
n
inequality d0
d
w
t becomes exact equality. For this
purpose at nondegeneracy commutation
B
with all
v is necessary. We will realize, for a moment, reduc-
tion
L
to the diagonal form. If among eigenvalues of
this matrix are various ones, on a commutation require-
ment in v there can not be transitions between states
of corresponding groups, i.e. the connectivity condition
is broken. Could be considered that the matrix
L
is
proportional the unit matrix, but then
and are
proportional each other and if to regard normalization, it is
B
simple B
. In any other case the condition d0
d
w
t
is fulfilled, and from here it is already easy to conclude
about an attraction of any state
t
to stationary
(obviously, thus to the only state).
B
5. Generalization of the Caldeira-Leggett
Equation
Many authors were engaged in obtaining of a kinematic
quantum equations for the case of continuous set of
states. Partial survey is given in [1]. However, the prem-
ises and conclusions in some cases raise doubts; to trace
the cause of contradictions is sometimes difficult. Here
we have selected other path: at once we will apply the
Lindblad equation in such shape that it could be com-
pared with the linear classical Langeven equation. For
this purpose it is possible to take
222
,
22
pmwq
H
Lpi
mq
  (39)
(
is the complex parameter, the magnitude
is real).
In [1] author uses similar equation taken from Stenholm,
however these arguments are represented to us a little
convincing. From a point of sight of symmetry and ease
of check our Equation (39) has advantage.
The idea to search Gaussian solutions arises

22
2
,,
x
xxx
xx ce
 

 
(40)
where
is real, c- also real normalizing coefficient

2Re
c
,
and Re
. Last requirement is necessary and
enough for positive definiteness
owing to the Me-
ler’s formula [15], see also (in less convenient shape)
[16]


 
22
22 2
2
2
2
0
41
1exp 21
1
e2 !
xy n
nnn
n
.
x
yt xyt
t
t
t
HxH y
n
 
(41)
Then after substitution (41) in the evolutionary Lind-
blad equation in our case the system of the ordinary dif-
ferential equations for

,t

2
t is gained and the
normalization should be fulfilled automatically. However
more simply to come to the purpose as in [1], composing
(linear) equations for the moments of the second order,
immediately multiplying the left and the right members
(40) on and taking matching tracks. So,
for the time functions
2
,, ,q qppqp
 
 

 

22
2
2
222
2
2
22
1
,d ,
4Re
,d
,
Re
,
1,
22
Im
2Re
xx
x
x
ft qSpq
xxxx
tpSppx xx
x
xx
tpqqpixxx
x









 


 
(42)
Copyright © 2011 SciRes. JMP
V. A. ANTONOV ET AL.
Copyright © 2011 SciRes. JMP
525
we obtain following equations



22
2
22 2
222
d2 24Re ,
d
d224Re,
d
d2Im 4Re.
d
fvf
tm
mv
t
mf v
tm

 


  
 
 



(43)
The physical treatment of the system (43) is not diffi-
cult. The first terms of right members define a character-
istic evolution of object. The first terms in brackets give
diffusion. By the way, as it is clear and in [1], it is possi-
ble to set diffusion preferentially on coordinate if
it
is great. Certainly, the subsequent terms in brackets give
a systematic swing of oscillation, if Re 0
, and a
damping, if Re 0
.
For the stationary solution of system (43) it is enough
to write out

2
22
22 ,
2Re
m
mf



(44)
as becomes clear that at Re 0
it is physically unac-
ceptable and even is formally incompatible with any ad-
missible parameters
and
in the density function.
On the contrary, at Re 0
the system (43) has the
unique stationary solution which is simultaneously and
limiting one, as at characteristic indexes of matching
homogeneous system a real parts are negative.
To build a measure of proximity to stationary state by
a common rule - enough bulky operation, but an expres-
sion with similar properties is easy enough find immedi-
ately. Concretely
 

2
22
22
0
00
22,
22
m
xff
m


 
(45)
(000
,,f
- the stationary solution). At Re 0
we
have d0
dt
.
At the arbitrary non-Gaussian shape of a density func-
tion the problem on its evolution becomes more compli-
cated. But if to be interested only qualitative asymptotic
behavior
,,
x
xt
, the answer is gained at once: at
Re 0
in view of a nondegeneracy of steady state
there should be a monotone degree of proximity and
consequently the limiting
must be always the Gaus-
sian, at least the initial
0
and was not that.
6. The Systems without Feedback
The evolutionary equation for the systems subject to ca-
sual exterior action was inferred many times [11]. Here
we prefer the following common approach. At the regu-
lar affecting the evolution of physical system would sub-
mit to the law
 
e0e
iHt iHt
t

.
(46)
Let concrete affecting lasts a small interval of time
0,t then decomposition of a right member (46) on t as
to within
2
Ot gives to small parameter
 
 

22 22
22
2
22
2
2
2
101
22
02
iHtHtiHtH t
t
it t
HHH H
tHH

 

 


 



(47)
If in
H
there is a randomness, in the right member
(47) it is necessary to exchange operators 2
,
H
H and
H
H
their statistical averages (is marked out by angu-
lar brackets). We will compare effect to what would be
gained if affecting was spotted at once by average
H
.
The difference as it is easy to see, consists only in terms
of the second order on t
 
22
22
22
22
0...
2
iHtiHt tt
teeHHHHHH H H
 







(48)
Let's uncover average in an explicit form through
probabilities j
and implementation of matching op-
erators:
 

22
e0e
2,
iHt iHt
ij ijijij
ij
t
HH HH






(49)
1
,
n
j
j
j
H
H
etc., with
.
iji jij
HH


H
(50)
where . After some rearrangement of
terms the expression (48) it is reduced to
1
0, 1
n
jj
j

Going over to the averaged time, we obtain the Lind-
blad formula (16) from [11], but with one important
526 V. A. ANTONOV ET AL.
limitation: the operator
j
L
ji
q
can only be Hermitian.
There is reason to see here an analogy with symmetry of
the Markov chain . Anyway, as we now show,
the entropy in our example increases monotonically. In-
deed, it is easily seen that the first term on the right side
(16) has no relation to the change in entropy. If we re-
strict the discrete set of states, then
ij
q
can be reduced
to diagonal form
1
2
0
0.
0n






 

(51)
In the same representation the elements v we mark
as ij . For example, at
L
l20
n
 
ii
calculation of
the diagonal elements
M
of the matrix in brackets in
(16) gives
2
2
11111 1
2
2,2
n
ijj j
i
.
M
lM l
 
(52)
The trace 11 nn
M
M
,,,
n
, as one would expect, is
equal to zero. From (52) it is clear that the diagonal ele-
ments 12

as time functions submit to the
symmetrical system of the evolutionary equations of the
Markov processes. On proved above, the combination
 
1
ln
n
ii
i
tt

monotonically increases. According to the Schur theo-
rem [7] the union of the diagonal elements i
is ma-
jorized in Hardy, Littlewood and Pais sense by charac-
teristic numbers i
of the same matrix
. From here
follows
 
 
11
1
ln ln
0ln0,
nn
ii ii
ii
n
ii
i
Stt ttt
 


 


i.e.

0,StS (53)
as was to be shown.
From the physical point of view lack of inverse influ-
ence of a system on background is characteristic namely
for very hot background - after that not so surprisingly
that different states of the system are aimed to gain an
equal weight. The univalent asymptotic effect, naturally,
is gained only at a finite number of states of the system.
Similarly, in the classical case of symmetrical diffusion

1
2
f
f
Dx
tx x



(54)
nonzero limit for the density function f at is
gained, only if diffusion is artificial is restricted by walls
(or tending of the diffusion coefficient to zero on
final distance).
t
D
7. The Quantum Diffusion of Free Particle
For a free particle on the background of an infinite set of
oscillators in [17,18] found the evolution equation
  
2
,,,,,
iD i
Hqq qp
t

 


 



(55)
(«+» means anticommutator). The Equation (55), gener-
ally speaking, does not fulfill to a requirement of con-
servation of positive definiteness
(and consequently
is not the special case (16)). For check it is possible at
0, 0HD
to substitute at values in the right side (55)
the “pure” state expressed through some even function
x
 
11
,,xxx xt

0.
At usual representation entering into (55) operators

 
1
11
,,
,
qxxxxx
pxxix x


1
..
(56)
we obtain
 
 

111111
2
11 111
0.
.
ttxxxxxxxxxxxx
xxxx txxtxxxtxxxO
 
  

 


 




 



(57)
Last two terms in the right member (57) always it is
possible to present in the form
 
 
**
**
tx xxxxx
x
xxxx
 
 








x
(58)
with complex coefficients
and
, selected so that
the functions

x
x
 

x
(59)
were crossly orthogonal; an orthogonality of both func-
tions to
x
follows from difference of parity. Then
in the right member (57) it is had standard decomposition
with one negative coefficient, i.e. obtained a sign-inde-
finite form, contrary to the instructions in [1].
Copyright © 2011 SciRes. JMP
V. A. ANTONOV ET AL.
527
Exclusion makes a case when one of combinations (59)
is equal to zero, i.e. at Gaussian shape
1
,
x
x
. Then,
apparently, contradictions do not originate and at least in
case the functional Equation (55) is reduced to
system of the ordinary differential equations. Indeed, let
0H
22
11
2,
x
xxx
ce
 

(60)
where on the norming condition should be
2.
π
c

(61)
For an regularity behavior of the function (60) it is
necessary to induct restrictions
Re0,Re .

(62)
Using (56), we uncover (55):
 

2
22
11 11
2
dd d2.
ddd
cD
cxx xxcxxcxxxx
ttt t
  




1
(63)
Function
ct of a special role does not play, as is
automatically defined by the norming condition. From
the common Equation (63) remains


2
2
d2,
d
d2.
d
D
tD
t


 
 
(64)
The decision of the linear Equation (64) is easy


24
2
4
2
,
4
,con
4
tt
t
D
tiege
D
tgec

 


 
 
st,
(65)
where
,
g
,
are the integration constants.
On the other hand,
0
Px should be the solution for
(1) without the left part, so after multiplication on

0
ln Px
Px and integration
 
  
 


 
00 01
011101 10111
01
ln,ddln,ddln,d d0.
Px PxPxPx
PxqxxxxPxqxxxxPxqxxxx
PxPxP xPx

 
Subtraction gives
 
 
01
101 1
01
dln,dd.
d
PxPx
SPxPxqxxxx
tPxPx



 1
(66)
2
dd
d2d
2dd
d1d1d1d
dd0.
(67)
dd
2d2d2
bf
bafbx
axx
Sfbf
xafx
tbfx xxbf


 




 

 









8. About Paths of Solution of the
Schrödinger’s Cat Paradox
The previous notes prepare for thought that a solution of
the problem of transition from quantum world in classi-
cal world inherently cannot be simple. About it we will
underline that in this problem it is impossible to look
back. Different versions of “the latent parameters” (in
classical sense), still seriously considered in the middle
of the XX-th century [19], are now rejected by all de-
velopment of the quantum mechanics, its interior logical
organization and doubtless successes. Now it is neces-
sary to take simply unusual of the microworld which in
the general-theoretical sense can be interpreted as con-
siderably greater, in comparison with a macrocosm, an
information capacity [20]. In particular, the Bell’s ine-
qualities [21] hardly deserve their so frequent analysis in
up-to-date controversies [22] just because in the devel-
oped apparatus of quantum mechanics in them there is no
necessity. If the Bell’s inequalities nevertheless were
carried out, it would mean not simply strangeness, and
any full illogicalness of the quantum world that, fortu-
nately, doesn’t happen.
The transition from micro- to macro world, figura-
tively speaking, can be represented by a narrow neck of
the bottle, through which one capacious in the informa-
tion regarding a microcosm of our macrocosm can leak
only a very small piece of information. Note also that
choice of the one variant among many ones means a de-
crease in entropy, in contrast to its increase, which is
characteristic of the process, incidentally, is also reversi-
ble, microscopic interaction with the background of an
Copyright © 2011 SciRes. JMP
528 V. A. ANTONOV ET AL.
infinite temperature.
Clearly, the equation describing the transition from
micro- to macro world must be non-linear one, otherwise,
according to Schrödinger, would be possible superposi-
tion of the states of live and dead cat. But the search for
appropriate nonlinearity randomly or blindly [23] is not
productive—an experiment all such attempts quite easily
refutes [24,25].
And already now we can tell confidently enough that
nonlinear members should have, first, all-round influence,
secondly, smooth in space and time, as a result to be al-
most or not so not found out within the limits of the mi-
crocosm. More precisely, the first condition means that
there should not be a regular preference which could
collect eventually and deform known statistical regulari-
ties. In particular, apparently, it is necessary to be careful
not to introduce members which would break the law of
conservation of energy. Under the smoothness of the
action we mean the absence of unmotivated scattering
centers and a sufficiently large characteristic time greater
than the most common atomic and molecular transfor-
mations. The essence of the nonlinear interaction we see
a slow non-directional change of the phases and ampli-
tudes of the basis wave functions, for example, charac-
terizing the standard motion of individual molecules in a
gas. Stealth aftereffects then follows simply from the fact
that these nonlinear effects have “to sink”, i.e. disguised
among ordinary perturbation (collision of gas molecules,
etc.).
Another matter—the states that include the change of
macroscopic objects, for example, the “Schrödinger’s
cat”. Conventional thermodynamic fluctuations do not
connect them and do not interfere with nonlinear effects.
The choice is ultimately one of the macroscopic state of
the two, or many, and the resulting decrease in entropy
achieved in all probability, only one way: assumptions
that nature doesn’t suffer superposition of macroscopic
states of a certain type, and that among them there is a
diffusion, as in the well-known simplified the problem of
the “gambler’s ruin” until the matter is not reduced to a
single, macroscopically admissible states. Sketch of such
theory is given in [27]. But with non-linear equations do
not get exact performance of the Born postulate: “the
probability of a macroscopic event is proportional to the
square of the amplitude of the wave function”. However,
it should be noted: experimental verification of the Born
postulate - not out of the circle of those results for which
the successful testing of many decimal places is a matter
of pride physicists. In fact, exactness of the Born postu-
late in treatment of the electron diffraction experiments,
etc., in general, although satisfactory from the standpoint
of practical needs, but in the long term it is necessary to
consider possibility of essential infringement of the Born
postulate in some special experiments.
The widespread objection that nonlinearity destroys all
habitual apparatus of the quantum mechanics, is substan-
tially based on fear before new and unusual which in the
twentieth century beginning in the same way prevented
to recognize and the general theory of relativity—after
all the gravitational field equations on Newton are linear,
remarkably convenient and symmetric. On the other
hand, are known examples when even sharply nonlinear
in itself phenomenon outwardly acts as effect of certain
linear forces [28]. Similar things—a harmonious and
statistical linearization of control systems [29].
9. The Cosmic Factors
For us, it is clear that the source of the diffusion trans-
formation of the wave function should be not in itself
(otherwise it would be a regular evolution for no ran-
domness), but something external. After all, even ordi-
nary diffusion of an atom or an electron has its own ran-
dom factors in the form of aftershocks of the neighboring
particles. In problem of the “Schrödinger’s cat” should
look for this external factor in the macroscopic condi-
tions? In principle, perhaps, but a few plausible, because
the macroscopic parameters, in general, varies smoothly
and in a regular manner, then the result of the process as
even the act of radioactive decay clearly would depend
on the macro environment, which is not observed. It re-
mains to assume that it is a factor at all parties for the
bodies involved in the experiment. It is likely the effect
of cosmic factors. Confirmation is found correlations in
geographically separate experiments with macroscopic
fluctuations: the correlation as a mutual, and with the
astronomical factors [30,31].
10. Whether the Collapse of Quantum States
in the Equilibrium Environment Is
Necessary?
An important conclusion from the foregoing is, we think,
very similar tending to statistical equilibrium of many-
particle system on the one hand, and single particle or
even a small system surrounded by a stationary back-
ground, on the other side. In any case, statistical equilib-
rium (if it exists) corresponds to the “potential well”, to
which the system and aims to be simple, monotonous
way.
While we did not talk about any collapse or splitting
of the wave packets. But there is a need for equilibrium
systems (e.g., gases) to consider processes with collapses
of the wave functions? For example, in [1], it seems,
allowed the existence of such processes with the collapse
of a wide range of phenomena closer to equilibrium. In
Copyright © 2011 SciRes. JMP
V. A. ANTONOV ET AL.
529
contrast to [1], we are inclined to answer this question in
the negative if only because it the carefully grounded
quantum statistical mechanics [32,33] does not rely on
anything like a collapse that would only interfere. To
describe the same macroscopic characteristics of the
body are, in principle, clearly defined rules, practically
independent of the general theoretical views on the na-
ture of the relationship between classical and quantum
worlds. In each thermodynamic equilibrium body an
entanglement of the quantum states has already reached
the maximum extent possible, and continues to move just
nowhere. But it is not clear why this should interfere
with normal communication with macroscopic bodies as
a whole with the classical objects.
You can certainly raise the issue of fluctuations. But
the fluctuations in equilibrium systems are not available
to our perception. For example, there is no contradiction
to say that the fine particles (although the virus) under-
goes Brownian motion is completely under the laws of
quantum mechanics. But to see this movement, it is nec-
essary to put the object beam, i.e., to create a highly
non-equilibrium conditions. Likewise, for example,
fluctuations in electrical resistance are a thing in itself,
until a sample is not omitted current, and fluctuations in
atmospheric density can not be noticed until after it did
not get addressed, i.e., again, non-equilibrium radiation,
etc. But with creation of non-equilibrium, the problem of
fluctuations is transferred to another plane.
11. The Systems with Large Dispersion
It must say little about interesting case where the equilib-
rium state is not reached at least once until the disper-
sions of the values and , under a certain typical
frequency
q p
, not to exceed substantially the Heisenberg
limit. The formal apparatus of quantum mechanics this
did not prevent. For example, for Gaussian density func-
tion of the product

22
2
22
2,
4Re
qp



(68)
bounded below the certain limit
2
4
, but the rise to in-
finity occursconst, Re


. Authors [1,34], fac-
ing with like examples seems to be thinking about action
of sertain supplementary law, which automatically con-
verts corresponding states in the category of classic ones.
However, this can hardly agree. Indeed, in statistical plan
the states with high values of dispersion (that practically
equivalent growing of the temperature of the background)
with good accuracy obey to the classical mechanics laws.
But that is not directly related with the issue of choosing
a line of the macroscopic development, and does not
solve the Schrödinger’s cat paradox. The very same sim-
plest (in words) assumptions: “the wave packet splits in
achieving of sufficient randomness” is clearly not held,
as seen from the inconsistency of the various phenomena
of this kind in [9] and from experimental fact of the ma-
nifestation of interference to account disguised correla-
tions under, seamingly, the chaotic density function of an
atom. In this regard, there are illustrative examples of the
photon [35] and plasma [36] echo.
12. Prospects
The instances specified above underline that the logic of
development of the physical science demands in proxi-
mal years of assimilation of the nonlinear quantum me-
chanics. Such point of view has been stated and justified
by us in [27]. There is the mathematical instance of con-
struction of the nonlinear quantum mechanics and con-
sidered set of partial cases on description of evolution of
the wave function in intermediate zone (the mesoworld)
between the microworld and the macroworld. Essential
there is an understanding of processes of scattering of the
wave packet, and also that the Born’s postulate has re-
stricted character. In this connection remains to add the
following. Apparently, the important role in processes of
a decomposition of the wave packets is played the ran-
dom character of an energy spectrum on the intermediate
stage of the mesoworld. According to instances given in
[37], the randomness often originates at interacting of
highly exited particles or molecules with environmental
small collectives, that is typical for the mesoworld. Dis-
persion of the wave packets happens, apparently, on
clusters of atoms or molecules with characteristic sizes
103 - 104 Ǻ. From the physical point of view the disper-
sion on cluster corpuscles is presented by the formula
[38]
6,
S
D
I

(69)
where
—the intensity of scattered radiation, S—the
fractal dimension of the cluster scattering surface. We
pay attention to random character of energy spectrums
also because the systems with regular spectrum are stud-
ied enough: their quantum properties corresponding to
the usual theory are often prolonged in the macrocosm in
the form of various macroscopic quantum appearances.
Therefore the greatest chances to find out the quantum
nonlinearity are available there where for an interference
of wave packages earlier didn’t search.
D
The reference to quasi-stationary states in [1] also
serves, inevitably at first, to simplification of an essence
of the matter. Most likely, at more exact analysis it is
necessary to connect external world influences with tran-
Copyright © 2011 SciRes. JMP
530 V. A. ANTONOV ET AL.
sitions between different conditions. Otherwise is not
absolutely clear, as it is possible to register quantum
jumps [39] in a state of separate or several atoms. In de-
scribing the atom simply the density function without
taking into account the dynamics of interaction with the
background would have been a simple stationary, does
not give grounds for splitting.
Let's address now to effect of Sokolov. In Sokolov’s
experiments [40]—here we enter on shaky grounds—
confuses independence of the effect in an aspect of “the
Demon field” from a beam intensity of atoms so the
nonlinearity of the Schrodinger equation vanishes. We
offer several other interpretation of the Sokolov’s ex-
periment: apparently, the surface of the sample of metal
by which microparticles (atoms of hydrogen) flew by, in
these experience was in the special, hardened state when
in surface layer a quantum superposition of collective
states gradually are destroyed by interacting with sepa-
rately flying atoms, which execute role of a certain cata-
lytic process. Then each atom of hydrogen calls the ef-
fect, and effects are simply summed up. If our assump-
tion of the reason of the effect is truly, has to be observed
a gradual “aging”, or effect exhaustion at the long-term
use of installation with the same piece of metal (from the
published reports of Sokolov’s effect not clearly,
whether there is such process of an aging actually). By
the way, finiteness of a time of “viability” of equipment
detecting cosmic impacts (not quite us comprehensible) it
is underlined in [41].
With under discussion by complex of the problems,
probably, are bound events of the enigmatic delay to
registrations of the effect in absolutely different experi-
ments. Here pertains emission of Rydberg’s atoms in
resonator [42], and also the quantum effect of Zeno [43]
and registration of wide atmospheric showers with en-
ergy эВ [44]. Here should be adding on and es-
tablished experiments with macroscopic fluctuations in
the registration of radioactive decay, etc. What has
shown, in particular, the following debate in UFN, results
on explanation of macroscopic fluctuations do not pack
nor in what rules of the statistics if consider that registra-
tion goes in mode of the realtime—thence need to postu-
late the delay of the order of the second. At last, though
here it is not visible to connection with quanta yet, there
is a problem of rare “delayed echo” in a radio communi-
cation [45], not explainable, on condition of observation,
reflexion from something. Thus, the impression is made
that sometimes the nonlinear quantum process detain on
intervals of the order of second an information exit in our
usual world. Perhaps these facts are actually more, but
they are hidden in small editions available or not pub-
lished under the pretexts of strangeness.
16
10
In summary, unlike [23], we will underline objective
character of a problem of the transition a microcosms-
macrocosm. Just research in recent decades clearly
demonstrate the reality of the processes occurring in the
intermediate scale, in contrast to the era of birth of
quantum mechanics, where the transition from the proc-
esses of the microworld seemed something of a jump
across the gap. Now this gap is gradually filled. Continue
to close our eyes to mezoworld as important as physi-
cally real band—then advance to build barriers to learn-
ing. In experiments with microobjects we deal with facts
as real as the phenomena that surround us. A suitable
analogy might be a statistical statement: malaria inci-
dence is higher in wetlands. Very poor would have been
in our time, one epidemiologist, who announced to the
swamp “of the primary accident” and thus would have
missed the most important factor—the mosquito!
13. Conclusions
Some characteristics of the Markov chains (processes)
are specified and the important property of monotonicity
of a probability is formulated. It is entered notion to rela-
tive entropy and is found monotonous nature its behaviour
in classical case. For study of irreversibility phenomena
in quantum problems by new methods is received the
Lindblad’s equation and its physical essence is explained.
Deep analogy between the classical Markov processes
and development described by the Lindblad’s equation is
conducted. Using method of comparison of the Lind-
blad’s equation with the linear Langevin equation we
receive a system of differential equations, which are
more general, than the Caldeira-Leggett equation. We
consider quantum systems without inverse influence on a
surrounding background with high temperature. Quan-
tum diffusion of a single particle is considered and pos-
sible ways of the permission of the Schrödinger’s cat
paradox and the role of an external world for the phe-
nomena with quantum irreversibility are discussed. In
spite of previous opinion we conclude that in the equilib-
rium environment is not necessary to postulate the proc-
esses with collapses of wave functions. We draw atten-
tion to the fact that the Heisenberg’s uncertainty relation
does not always mean the restriction is usually the prod-
uct of the average values of commuting variables. It is
discussed row new experiments, in accordance with under
discussion problem of the quantum nonlinearity. We
underline that the logic of development of the physical
science demands in proximal years of assimilation of the
nonlinear quantum mechanics.
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