Optimal conditions for Bell-inequality violation in the presence of decoherence and errors

Optimal conditions for Bell-inequality violation in the presence of decoherence and errors We obtain the set of all detector configurations providing the maximal violation of the Bell inequality in the Clauser–Horne–Shimony–Holt form for a general (pure or mixed) state of two qubits. Next, we analyze optimal conditions for the Bell-inequality violations in the presence of local decoherence, which includes energy relaxation at the zero temperature and arbitrary pure dephasing. We reveal that in most cases the Bell inequality violation is maximal for the “even” two-qubit state. Combined effects of measurement errors and decoherence on the Bell inequality violation are also discussed. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Quantum Information Processing Springer Journals

Optimal conditions for Bell-inequality violation in the presence of decoherence and errors

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Publisher
Springer US
Copyright
Copyright © 2011 by Springer Science+Business Media, LLC
Subject
Physics; Computer Science, general; Theoretical, Mathematical and Computational Physics; Quantum Physics; Mathematics, general; Physics, general
ISSN
1570-0755
eISSN
1573-1332
D.O.I.
10.1007/s11128-011-0242-1
Publisher site
See Article on Publisher Site

Abstract

We obtain the set of all detector configurations providing the maximal violation of the Bell inequality in the Clauser–Horne–Shimony–Holt form for a general (pure or mixed) state of two qubits. Next, we analyze optimal conditions for the Bell-inequality violations in the presence of local decoherence, which includes energy relaxation at the zero temperature and arbitrary pure dephasing. We reveal that in most cases the Bell inequality violation is maximal for the “even” two-qubit state. Combined effects of measurement errors and decoherence on the Bell inequality violation are also discussed.

Journal

Quantum Information ProcessingSpringer Journals

Published: May 21, 2011

References

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