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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. 3 — Mar. 1, 2012
  • pp: 397–406

Photon-subtracted squeezed coherent state: nonclassicality and decoherence in thermal environment

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


JOSA B, Vol. 29, Issue 3, pp. 397-406 (2012)
http://dx.doi.org/10.1364/JOSAB.29.000397


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Abstract

We introduce the photon-subtracted squeezed coherent state (PSSCS), which is theoretically constructed by repeatedly subtracting photons from the squeezed coherent state (SCS) with squeezing parameter r and displacement amplitude α=|α|eiφ. Employing the normal ordering form of density operator of the SCS, we study the nonclassicality of the PSSCS by analyzing Mandel’s Q-parameter, quadratures squeezing, photon-number distribution (PND), and Wigner function (WF). We find that the PND in a PSSCS is a periodic function of φ with a period π and exhibits more remarkable oscillations than that of a SCS in the case of strong squeezing. The partial negative region of the WF is sensitive to r and |α|. The fidelity between PSSCS and SCS is analyzed, which manifests that larger photon subtraction number may result in lower fidelity. By virtue of the thermal entangled state representation the decoherence of the PSSCS in thermal environment is studied through the time evolution of the WF. The negative volume of the WF gradually diminishes with the increase of evolution time and thermal photon number, respectively. The study of the PSSCS shows that generating new photon-number-controllable nonclassical states from a weak coherent light may be realized by subtracting suitable photons from a SCS.

© 2012 Optical Society of America

OCIS Codes
(270.0270) Quantum optics : Quantum optics
(270.6570) Quantum optics : Squeezed states

ToC Category:
Quantum Optics

History
Original Manuscript: September 30, 2011
Revised Manuscript: November 14, 2011
Manuscript Accepted: November 14, 2011
Published: February 22, 2012

Citation
Zhen Wang, Xiang-guo Meng, and Hong-yi Fan, "Photon-subtracted squeezed coherent state: nonclassicality and decoherence in thermal environment," J. Opt. Soc. Am. B 29, 397-406 (2012)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-29-3-397


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