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arXiv quant-ph/0201029quant-ph
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海森堡演化WKB与辛面积相

Heisenberg Evolution WKB and Symplectic Area Phases

T. A. Osborn, M. F. Kondratieva

摘要:

薛定谔和海森堡演化算符在量子相空间中用它们的外尔符号表示。它们的半经典近似分别在短时间和长时间范围内构造。对于这两个演化问题,WKB表示是纯几何的:振幅是泊松括号的函数,相位是相空间中由轨迹和弦限定的区域的辛面积。通过引入一个扩展的相空间,给出了薛定谔和海森堡半经典演化的统一方法。在这种情况下,马斯洛夫的伪微分算子版本的WKB分析适用于并代表这两个问题,通过一个共同的高维薛定谔演化,但不同的扩展哈密顿。拉格朗日流形在由初始数据定义的扩展相空间中的演化控制相位、振幅和焦散行为。辛区域相作为边界条件问题的解而出现。考虑了各种应用和示例。

英文摘要:

The Schrodinger and Heisenberg evolution operators are represented in quantum phase space by their Weyl symbols. Their semiclassical approximations are constructed in the short and long time regimes. For both evolution problems, the WKB representation is purely geometrical: the amplitudes are functions of a Poisson bracket and the phase is the symplectic area of a region in phase space bounded by trajectories and chords. A unified approach to the Schrodinger and Heisenberg semiclassical evolutions is developed by introducing an extended phase space. In this setting Maslov's pseudodifferential operator version of WKB analysis applies and represents these two problems via a common higher dimensional Schrodinger evolution, but with different extended Hamiltonians. The evolution of a Lagrangian manifold in the extended phase space, defined by initial data, controls the phase, amplitude and caustic behavior. The symplectic area phases arise as a solution of a boundary condition problem. Various applications and examples are considered.

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