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- Title
Wigner-function Evolution and Photon-number Decay of Quantum States in a Laser Cavity with the Kerr Medium.
- Authors
Wu, Meng-Yan; Lv, Heng-Yun; Wang, Ji-Suo; Liang, Bao-Long; Meng, Xiang-Guo
- Abstract
Using the thermal-entangled state representation theory, we solve the master equation describing a laser cavity with the Kerr medium, and find that the analytical evolution law of the density operator is governed by the infinitive Kraus operator-sum representation. Also, we obtain a new evolution formula of the Wigner function (WF) for any initial state in this cavity by rewriting the WF as a scalar product between two pure states. In term of the new WF formula, the WF evolution of the initial coherent and number states and the decay of photon number are also presented.
- Subjects
QUANTUM states; COHERENCE (Physics); REPRESENTATION theory; PHOTON counting; BIOLOGICAL evolution
- Publication
International Journal of Theoretical Physics, 2020, Vol 59, Issue 2, p350
- ISSN
0020-7748
- Publication type
Article
- DOI
10.1007/s10773-019-04328-9