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Mutual information-based approach to adaptive homodyne detection of quantum optical states

Bargatin, Igor (2005) Mutual information-based approach to adaptive homodyne detection of quantum optical states. Physical Review A, 72 (2). Art. no. 022316. ISSN 1050-2947. doi:10.1103/PhysRevA.72.022316.

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The author proposes an approach to adaptive homodyne detection of digitally modulated quantum optical pulses in which the phase of the local oscillator is chosen to maximize the average information gain, i.e., the mutual information, at each step of the measurement. The properties of this adaptive detection scheme are studied by considering the problem of classical information content of ensembles of coherent states. Simulations of quantum trajectories and visualizations of corresponding measurement operators demonstrate that the proposed measurement scheme adapts itself to the features of each ensemble. For all considered ensembles of coherent states, it consistently outperforms heterodyne detection and Wiseman's adaptive scheme for phase measurements [H.M. Wiseman, Phys. Rev. Lett. 75, 4587 (1995)].

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Additional Information:©2005 The American Physical Society (Received 26 May 2005; published 16 August 2005) I thank Prof. Hideo Mabuchi for comments on the manuscript and wish to acknowledge the financial support from Caltech’s Institute for Quantum Information during the summer of 2001, when the bulk of this work was done.
Subject Keywords:quantum optics; homodyne detection; optical modulation; information theory; quantum communication; optical communication
Issue or Number:2
Record Number:CaltechAUTHORS:BARpra05
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:1834
Deposited By: Archive Administrator
Deposited On:20 Feb 2006
Last Modified:08 Nov 2021 19:42

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