Enhancement of quantum correlations in qubit–qutrit system under decoherence of finite temperature

Enhancement of quantum correlations in qubit–qutrit system under decoherence of finite temperature We investigate the dynamics and protection of quantum correlations of a qubit–qutrit system under local amplitude damping channels with finite temperature. The comparison between entanglement and geometric measure of quantum discord (GMQD) is analyzed. It is found that the GMQD is more robust than the entanglement against the decoherence induced by the channels. Special attention is paid to how to protect the quantum correlations from decoherence by weak measurement and measurement reversal. We find that the weak measurement is not necessary when the initial state is maximally entangled. But for other initial states, a successful protection of quantum correlations requires combined weak measurement and measurement reversal. Under certain conditions, we also notice that we can realize the protection at finite temperature for GMQD, but not for entanglement. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Quantum Information Processing Springer Journals

Enhancement of quantum correlations in qubit–qutrit system under decoherence of finite temperature

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Publisher
Springer US
Copyright
Copyright © 2015 by Springer Science+Business Media New York
Subject
Physics; Quantum Information Technology, Spintronics; Quantum Computing; Data Structures, Cryptology and Information Theory; Quantum Physics; Mathematical Physics
ISSN
1570-0755
eISSN
1573-1332
D.O.I.
10.1007/s11128-015-0939-7
Publisher site
See Article on Publisher Site

Abstract

We investigate the dynamics and protection of quantum correlations of a qubit–qutrit system under local amplitude damping channels with finite temperature. The comparison between entanglement and geometric measure of quantum discord (GMQD) is analyzed. It is found that the GMQD is more robust than the entanglement against the decoherence induced by the channels. Special attention is paid to how to protect the quantum correlations from decoherence by weak measurement and measurement reversal. We find that the weak measurement is not necessary when the initial state is maximally entangled. But for other initial states, a successful protection of quantum correlations requires combined weak measurement and measurement reversal. Under certain conditions, we also notice that we can realize the protection at finite temperature for GMQD, but not for entanglement.

Journal

Quantum Information ProcessingSpringer Journals

Published: Feb 4, 2015

References

  • Quantum information and computation
    Bennett, CH; Sicincenzo, DP
  • Geometric measure of quantum discord
    Luo, SL; Fu, SS
  • Protecting entanglement from decoherence using weak measurement and quantum measurement reversal
    Kim, YS; Lee, JC; Kwon, O; Kim, YH

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