Estimation of the Repeatedly-Projected Reduced Density Matrix under Decoherence

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dc.creatorNakazato, H.
dc.creatorYuasa, K.
dc.creatorMilitello, B.
dc.creatorMessina, A.
dc.date2007-11-17
dc.date2008-04-23
dc.date.accessioned2026-07-07T09:33:54Z
dc.date.available2026-07-07T09:33:54Z
dc.descriptionDecoherence is believed to deteriorate the ability of a purification scheme that is based on the idea of driving a system to a pure state by repeatedly measuring another system in interaction with the former and hinder for a pure state to be extracted asymptotically. Nevertheless, we find a way out of this difficulty by deriving an analytic expression of the reduced density matrix for a two-qubit system immersed in a bath. It is shown that we can still extract a pure state if the environment brings about only dephasing effects. In addition, for a dissipative environment, there is a possibility of obtaining a dominant pure state when we perform a finite number of measurements.
dc.description14 pages
dc.identifierhttps://arxiv.org/abs/0711.2751
dc.identifierhttp://arxiv.org/abs/0711.2751
dc.identifierPhys. Rev. A 77 (2008) 042114
dc.identifierdoi:10.1103/PhysRevA.77.042114
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/159299
dc.subjectQuantum Physics
dc.titleEstimation of the Repeatedly-Projected Reduced Density Matrix under Decoherence
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