Quantum trajectories for realistic photodetection: II. Application and analysis.

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Title Quantum trajectories for realistic photodetection: II. Application and analysis.
Author Warszawski, Prahlad; Wiseman, Howard Mark
Journal Name Journal of Optics B: Quantum and Semiclassical Optics
Year Published 2003
Place of publication UK
Publisher Institute of Physics Publishing
Abstract In the preceding paper (Warszawski P and Wiseman H M 2002 J. Opt. B: Quantum Semiclass. Opt. 4 1) we presented a general formalism for determining the state of a quantum system conditional on the output of a realistic detector, including effects such as a finite bandwidth and electronic noise. We applied this theory to two sorts of photodetector: avalanche photodiodes and photoreceivers. In this paper we present simulations of these realistic quantum trajectories for a cavity quantum electro-dynamics scenario in order to ascertain how the conditioned state varies from that obtained with perfect detection. Large differences are found, and this is manifest in the average of the conditional purity. Simulation also allows us to comprehensively investigate how the quality of the photoreceiver (PR) depends upon its physical parameters. In particular, we present evidence that in the limit of small electronic noise, the PR quality can be characterized by an effective bandwidth, which depends upon the level of electronic noise and the filter bandwidth. We establish this result as an appropriate limit for a simpler, analytically solvable, system. We expect this to be a general result in other applications of our theory.
Peer Reviewed Yes
Published Yes
Publisher URI http://www.iop.org/EJ/journal/JOptB
Alternative URI http://dx.doi.org/10.1088/1464-4266/5/1/302
Copyright Statement Copyright 2003 Institute of Physics Publishing. This is the author-manuscript version of this paper. Reproduced in accordance with the copyright policy of the publisher.Please refer to the journal's website for access to the definitive, published version.
Volume 5
Page from 15
Page to 28
ISSN 1464-4266
Date Accessioned 2004-03-29
Language en_AU
Research Centre Centre for Quantum Dynamics
Faculty Faculty of Science
Subject PRE2009-Theoretical Physics
URI http://hdl.handle.net/10072/6307
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1

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