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Parametrization of the feedback Hamiltonian realizing a pure steady state

Yamamoto, Naoki (2005) Parametrization of the feedback Hamiltonian realizing a pure steady state. Physical Review A, 72 (2). Art. No. 024104. ISSN 1050-2947. http://resolver.caltech.edu/CaltechAUTHORS:YAMpra05

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Abstract

Feedback control is expected to considerably protect quantum states against decoherence caused by interaction between the system and environment. Especially, Markovian feedback scheme developed by Wiseman can modify the properties of decoherence and eventually recover the purity of the steady state of the corresponding master equation. This paper provides a condition for which the modified master equation has a pure steady state. By applying this condition to a two-qubit system, we obtain a complete parametrization of the feedback Hamiltonian such that the steady state becomes a maximally entangled state.


Item Type:Article
Additional Information:©2005 The American Physical Society (Received 9 March 2005; published 30 August 2005)
Subject Keywords:quantum entanglement; feedback; master equation
Record Number:CaltechAUTHORS:YAMpra05
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:YAMpra05
Alternative URL:http://dx.doi.org/10.1103/PhysRevA.72.024104
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:2811
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:28 Apr 2006
Last Modified:26 Dec 2012 08:51

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