Reversing entanglement change by a weak measurement
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Entanglement of a system changes due to interactions with the environment. A typical type of interaction is amplitude damping. If we add a detector to monitor the environment and only select the no-damping outcome, this amplitude damping is modified into a weak measurement. Here we show that the entanglement change of a twoqubit state due to amplitude damping or weak measurement can be probabilistically reversed. For the amplitudedamping case, the entanglement partially recovers under most conditions. For the weak-measurement case, the recovery of the initial entangled state is exact. The reversal procedure involves another weak measurement, preceded and followed by bit flips applied to both qubits.We propose a linear optics scheme for the experimental demonstration of these procedures. 2010 The American Physical Society.
author list (cited authors)
Sun, Q., Al-Amri, M., Davidovich, L., & Zubairy, M. S.
complete list of authors
Sun, Qingqing||Al-Amri, M||Davidovich, Luiz||Zubairy, M Suhail