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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. 11 — Nov. 1, 2012
  • pp: 3072–3077

Posterior quantum dynamics for a continuous diffusion observation of a coherent channel

Anita Dąbrowska and Przemysław Staszewski  »View Author Affiliations


JOSA B, Vol. 29, Issue 11, pp. 3072-3077 (2012)
http://dx.doi.org/10.1364/JOSAB.29.003072


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Abstract

We present the Belavkin filtering equation for the intense balanced heterodyne detection in a unitary model of an indirect observation. The measuring apparatus modelled by a Bose field is initially prepared in a coherent state and the observed process is a diffusion one. We prove that this filtering equation is relaxing: any initial square-integrable function tends asymptotically to a coherent state with an amplitude depending on the coupling constant and the initial state of the apparatus. The time development of a squeezed coherent state is studied and compared with the previous results obtained for the measuring apparatus prepared initially in the vacuum state.

© 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
(270.5290) Quantum optics : Photon statistics
(270.6570) Quantum optics : Squeezed states
(270.5585) Quantum optics : Quantum information and processing

ToC Category:
Quantum Optics

History
Original Manuscript: July 17, 2012
Revised Manuscript: September 20, 2012
Manuscript Accepted: September 20, 2012
Published: October 18, 2012

Citation
Anita Dąbrowska and Przemysław Staszewski, "Posterior quantum dynamics for a continuous diffusion observation of a coherent channel," J. Opt. Soc. Am. B 29, 3072-3077 (2012)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-29-11-3072

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