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Wigner Function for Harmonic Oscillator and The Classical Limit

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arxiv 2104.06638 v1 pith:HO7GWK5Z submitted 2021-04-14 quant-ph physics.class-ph

Wigner Function for Harmonic Oscillator and The Classical Limit

classification quant-ph physics.class-ph
keywords classicalfunctionwignerlimitstatesexcitedfoundharmonic
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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The Wigner function is a quantum analogue of the classical joined distribution of position and momentum. As such is should be a good tool to study quantum-classical correspondence. In this paper, the classical limit of the Wigner function is shown using the quantum harmonic oscillator as an example. The Wigner function is found exactly for all states. The semi-classical wavefunctions for highly excited states are used as the approach to the classical limit. Therefore, one can found the classical limit of the Wigner function for highly excited states and shown that it gives the classical microcanonical ensemble.

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