期刊
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS
卷 44, 期 21, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0953-4075/44/21/215501
关键词
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资金
- NSFC [60873119, 11005027]
- Higher School Doctoral Subject Foundation of Ministry of Education of China [200807180005]
- Superior Dissertation Foundation of Shaanxi Normal University [S2009YB03]
- National Research Foundation
- Ministry of Education, Singapore [WBS: R-710-000-008-271]
- Natural Science Foundation of Zhejiang Province [Y6090058]
- Hangzhou Normal University [HNUEYT 2011-01-011]
We study the dynamics of quantum discord (QD) of two qubits independently coupled to an Ising spin chain in a transverse field, which exhibits a quantum phase transition. For this model, we drive the corresponding Kraus operators, obtain the analytic results of QD and compare the dynamics of QD with the dynamics of relative entropy of entanglement nearby the critical point. It is shown that the impact of the quantum criticality environment on QD can be concentrated in a very narrow region nearby the critical point, so it supplies an efficient way to detect the critical points. In the vicinity of the critical point, the evolution of QD is shown to be more complicated than that of entanglement. Furthermore, we find that separable states can also be used to reflect the quantum criticality of the environment.
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