Reversing entanglement change by a weak measurement Academic Article

abstract

• 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.

authors

• Davidovich, Luiz
• Zubairy, Muhammad

published proceedings

• PHYSICAL REVIEW A

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

publisher

• American Physical Society (APS)  Publisher

published in

• Physical Review A: Atomic, Molecular and Optical Physics  Journal

keywords

• 51 Physical Sciences
• 5108 Quantum Physics

Digital Object Identifier (DOI)

• 10.1103/PhysRevA.82.052323

URI

• http://dx.doi.org/10.1103/PhysRevA.82.052323

start page

• 052323

volume

• 82

issue

• 5

URL

• http://dx.doi.org/10.1103/physreva.82.052323