Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum Reversibility Is Relative, Or Do Quantum Measurements Reset
  Initial Conditions?   I compare the role of the information in the classical and quantum dynamics
by examining the relation between information flows in measurements and the
ability of observers to reverse evolutions. I show that in the Newtonian
dynamics reversibility is unaffected by the observer's retention of the
information about the measurement outcome. By contrast -- even though quantum
dynamics is unitary, hence, reversible -- reversing quantum evolution that led
to a measurement becomes in principle impossible for an observer who keeps the
record of its outcome. Thus, quantum irreversibility can result from the
information gain rather than just its loss -- rather than just an increase of
the (von Neumann) entropy. Recording of the outcome of the measurement resets,
in effect, initial conditions within the observer's (branch of) the Universe.
Nevertheless, I also show that observer's friend -- an agent who knows what
measurement was successfully carried out and can confirm that the observer
knows the outcome but resists his curiosity and does not find out the result --
can, in principle, undo the measurement. This relativity of quantum
reversibility sheds new light on the origin of the arrow of time and elucidates
the role of information in classical and quantum physics. Quantum discord
appears as a natural measure of the extent to which dissemination of
information about the outcome affects the ability to reverse the measurement.

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The categories of this paper are: physics
27
The categories of this paper are: comp-gas
10
The categories of this paper are: q-bio
23
The categories of this paper are: solv-int
37
The categories of this paper are: supr-con
32
The categories of this paper are: atom-ph
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The categories of this paper are: plasm-ph
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The categories of this paper are: econ
16
The categories of this paper are: stat
35
The categories of this paper are: mtrl-th
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The categories of this paper are: hep-ex
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The categories of this paper are: chao-dyn
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The categories of this paper are: nucl-ex
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The categories of this paper are: gr-qc
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The categories of this paper are: math
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The categories of this paper are: adap-org