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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Editor: Henry van Driel
  • Vol. 29, Iss. 7 — Jul. 1, 2012
  • pp: 1835–1843

Squeezed number state and squeezed thermal state: decoherence analysis and nonclassical properties in the laser process

Xiang-guo Meng, Zhen Wang, Hong-yi Fan, and Ji-suo Wang  »View Author Affiliations


JOSA B, Vol. 29, Issue 7, pp. 1835-1843 (2012)
http://dx.doi.org/10.1364/JOSAB.29.001835


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Abstract

We investigate how the squeezed thermal state (STS) and squeezed number state (SNS) evolve undergoing decoherence in the laser process. Remarkably, the initial SNS, an example of a pure state, evolves into a mixed state, which turns out to be a Laguerre polynomial of combination of creation and annihilation operators within normal ordering; however, the STS, a mixed state, still keeps squeezed and thermal. At long times, these fields lose their nonclassical nature and decay to a highly classical thermal field. The normally ordered density operators of such states in the laser channel lead to deriving the analytical time-evolution expressions of the Wigner functions (WFs). Their nonclassicality is investigated in reference to the time-evolution WFs, which indicates that both of the WFs decay to the same thermal WF as a result of decoherence when the decay time t or the cavity loss κ of the laser is large enough.

© 2012 Optical Society of America

OCIS Codes
(000.5490) General : Probability theory, stochastic processes, and statistics
(270.0270) Quantum optics : Quantum optics
(270.2500) Quantum optics : Fluctuations, relaxations, and noise

ToC Category:
Quantum Optics

History
Original Manuscript: February 22, 2012
Revised Manuscript: April 23, 2012
Manuscript Accepted: April 26, 2012
Published: June 29, 2012

Citation
Xiang-guo Meng, Zhen Wang, Hong-yi Fan, and Ji-suo Wang, "Squeezed number state and squeezed thermal state: decoherence analysis and nonclassical properties in the laser process," J. Opt. Soc. Am. B 29, 1835-1843 (2012)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-29-7-1835

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