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Reversing entanglement change by a weak measurement

Author(s): Sun, QQ (Sun, Qingqing); Al-Amri, M (Al-Amri, M.); Davidovich, L (Davidovich, Luiz); Zubairy, MS (Zubairy, M. Suhail) Source: PHYSICAL REVIEW A, 82 (5): Art. No. 052323 NOV 19 2010

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 two-qubit state due to amplitude damping or weak measurement can be probabilistically reversed. For the amplitude-damping 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.

Author(s):  Sun, QQ (Sun, Qingqing); Al-Amri, M (Al-Amri, M.); Davidovich, L (Davidovich, Luiz); Zubairy, MS (Zubairy, M. Suhail)
Source:  PHYSICAL REVIEW A, 82 (5): Art. No. 052323 NOV 19 2010 
Language:  English 
Document Type:  Article 
KeyWords Plus:  QUANTUM MEASUREMENT; LOGICAL REVERSIBILITY; SYSTEMS; STATE 
Addresses:  [Sun, Qingqing; Zubairy, M. Suhail] Texas A&M Univ, Dept Phys, College Stn, TX 77843 USA; [Sun, Qingqing; Zubairy, M. Suhail] Texas A&M Univ, Inst Quantum Sci & Engn, College Stn, TX 77843 USA; [Al-Amri, M.] KACST, Natl Ctr Math & Phys, Riyadh 11442, Saudi Arabia; [Davidovich, Luiz] Univ Fed Rio de Janeiro, Inst Fis, BR-21941972 Rio De Janeiro, Brazil 
Reprint Address:  Sun, QQ, Texas A&M Univ, Dept Phys, College Stn, TX 77843 USA.
Funding Agency:  This work is supported by a grant from the King Abdul Aziz City for Science and Technology (KACST) and an NPRP grant from Qatar National Research Fund (QNRF). M.A. and L.D. gratefully acknowledge the hospitality at Texas A&M University where this work was done. L.D. acknowledges the support of the Brazilian National Institute of Science and Technology for Quantum Information and of the Brazilian agencies CNPq and FAPERJ.
Publisher:  AMER PHYSICAL SOC 
Publisher Address:  ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA 
ISSN:  1050-2947 
29-char Source Abbrev.:  PHYS REV A 
ISO Source Abbrev.:  Phys. Rev. A 
Subject Category: Optics; Physics, Atomic, Molecular & Chemical 
ISI Document Delivery No.: 682IU 
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