Physics – Quantum Physics
Scientific paper
2007-11-17
Phys. Rev. A 77 (2008) 042114
Physics
Quantum Physics
14 pages
Scientific paper
10.1103/PhysRevA.77.042114
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.
Messina Andrea
Militello Benedetto
Nakazato Hiromichi
Yuasa Kazuya
No associations
LandOfFree
Estimation of the Repeatedly-Projected Reduced Density Matrix under Decoherence does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Estimation of the Repeatedly-Projected Reduced Density Matrix under Decoherence, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Estimation of the Repeatedly-Projected Reduced Density Matrix under Decoherence will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-61198