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Parametrization of the feedback Hamiltonian realizing a pure steady state

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arxiv quant-ph/0603040 v1 pith:D4RJAWBR submitted 2006-03-06 quant-ph

Parametrization of the feedback Hamiltonian realizing a pure steady state

classification quant-ph
keywords feedbackstatesteadyconditiondecoherenceequationhamiltonianmaster
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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 steadystate 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.

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