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Estimation of the repeatedly projected reduced density matrix under decoherence

  • Autori: Nakazato, H.; Yuasa, K.; Militello, B.; Messina, A.
  • Anno di pubblicazione: 2008
  • Tipologia: Articolo in rivista (Articolo in rivista)
  • OA Link:


Decoherence 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.