Quantum correlations of two qubits interacting with a macroscopic medium

Quantum correlations of two qubits interacting with a macroscopic medium We consider two particles of spin- $$1/2$$ 1 / 2 interacting with a one-dimensional $$N$$ N -spin array, which is an exactly solvable model. The dynamics of entanglement and quantum discord (QD) of the spins of the two particles is investigated by regarding the 1D $$N$$ N -spin array as the environment. It is found that although the entanglement may suffer a sudden death and a sudden birth in the evolution, it can neither be generated nor become larger than its initial value. Different from the entanglement dynamics, QD can be amplified and even be generated by the interaction between particles and the common environment. We also observe that QD decays asymptotically to zero and later experiences a rival when the average number of excitation in the 1D $$N$$ N -spin array becomes larger in the case of nonzero inter-distance between two particles. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Quantum Information Processing Springer Journals

Quantum correlations of two qubits interacting with a macroscopic medium

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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/s11128-015-0931-2
Publisher site
See Article on Publisher Site

Abstract

We consider two particles of spin- $$1/2$$ 1 / 2 interacting with a one-dimensional $$N$$ N -spin array, which is an exactly solvable model. The dynamics of entanglement and quantum discord (QD) of the spins of the two particles is investigated by regarding the 1D $$N$$ N -spin array as the environment. It is found that although the entanglement may suffer a sudden death and a sudden birth in the evolution, it can neither be generated nor become larger than its initial value. Different from the entanglement dynamics, QD can be amplified and even be generated by the interaction between particles and the common environment. We also observe that QD decays asymptotically to zero and later experiences a rival when the average number of excitation in the 1D $$N$$ N -spin array becomes larger in the case of nonzero inter-distance between two particles.

Journal

Quantum Information ProcessingSpringer Journals

Published: Jan 29, 2015

References

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