Reversing entanglement change by a weak measurement Academic Article uri icon


  • 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.

published proceedings


author list (cited authors)

  • Sun, Q., Al-Amri, M., Davidovich, L., & Zubairy, M. S.

citation count

  • 141

complete list of authors

  • Sun, Qingqing||Al-Amri, M||Davidovich, Luiz||Zubairy, M Suhail

publication date

  • November 2010