A study on quantum discord sudden changes |
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Authors: | S L Wu H D Liu L C Wang X X Yi |
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Institution: | 1.School of Physics and Optoelectronic Technology,Dalian University of Technology,Dalian,P.R. China |
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Abstract: | For open quantum systems, quantum discord sudden changes (QDSCs) may appear in the
dynamics instead of sudden death appears in quantum entanglement. In this paper, we study
the dynamics of quantum discord and explore the relation between the entanglement sudden
death and QDSC. We find that the QDSC is sensitive to the initial states and the
excitation number in the total system (the qubits + environment). By using the geometric
measurement of the quantum correlation, the geometric interpretation for the QDSC is
presented and the condition for the emergence of the QDSC is given. Furthermore, we
observe that the entanglement sudden death and QDSC do not have one to one correspondence
for open quantum systems. |
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