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arXiv quant-ph/0601139quant-phnlin.CD
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紧致相空间上的量子经典对应

Quantum-classical correspondence on compact phase space

Martin Horvat, Tomaz Prosen, Mirko Degli Esposti

摘要:

我们建议研究经典和量子相空间分布之间的$L^2$ -范数距离,对于后者,我们选择Wigner函数,作为量子-经典对应的全局相空间指标。例如,这个量应该为理解量子和经典Loschlord回声之间的对应关系提供了一把钥匙。我们专注于紧凑(有限)经典相空间的完全混沌系统。通过数值模拟和启发式论证,我们发现量子-经典保真度在Eklfest型时间尺度内保持在1,与有效普朗克常量的对数成正比,在Eklfest型时间尺度之后,量子-经典保真度以最大的经典李雅普诺夫指数指数衰减.

英文摘要:

We propose to study the $L^2$-norm distance between classical and quantum phase space distributions, where for the latter we choose the Wigner function, as a global phase space indicator of quantum-classical correspondence. For example, this quantity should provide a key to understand the correspondence between quantum and classical Loschmidt echoes. We concentrate on fully chaotic systems with compact (finite) classical phase space. By means of numerical simulations and heuristic arguments we find that the quantum-classical fidelity stays at one up to Ehrenfest-type time scale, which is proportional to the logarithm of effective Planck constant, and decays exponentially with a maximal classical Lyapunov exponent, after that time.

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