Comment on "Time-dependent entropy of simple quantum model systems"

Details Comment on "Time-dependent entropy of simple quantum model systems" Comment on "Time-dependent entropy of simple quantum model systems"

2005-09-30

arxiv.org/abs/quant-ph/0509215v1

Phys Rev. A 72, (2005), 056101

Physics

Quantum Physics

Comment to appesr in Phys. Rev. A

Scientific paper

10.1103/PhysRevA.72.056101

In the above mentioned paper by J. Dunkel and S. A. Trigger [Phys. Rev. {\bf A 71}, 052102, (2005)] a hypothesis has been pursued that the loss of information associated with the quantum evolution of pure states, quantified in terms of an increase in time of so-called Leipnik's joint entropy, could be a rather general property shared by many quantum systems. This behavior has been confirmed for the unconfined model systems and properly tuned initial data (maximally classical states). We provide two particular examples which indicate a complexity of the quantum evolution. In the presence of a confining (harmonic) potential Leipnik's entropy may be non-increasing for maximally classical initial data. Another choice of initial data implies periodicity in time of the Leipnik entropy.

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