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题名: Amplification of quantum discord between two uncoupled qubits in a common environment by phase decoherence
作者: Yuan, Ji-Bing ;  Kuang, Le-Man ;  Liao, Jie-Qiao
刊名: JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS
出版日期: 2010
卷号: 43, 期号:16, 页码:-
关键词: SYSTEM
学科分类: Physics
通讯作者: Kuang, LM , Hunan Normal Univ, Key Lab Low Dimens Quantum Struct & Quantum Contr, Minist Educ, Changsha 410081, Hunan, Peoples R China
部门归属: [Yuan, JB; Kuang, LM; Liao, JQ] Hunan Normal Univ, Key Lab Low Dimens Quantum Struct & Quantum Contr, Minist Educ, Changsha 410081, Hunan, Peoples R China; [Yuan, JB; Kuang, LM; Liao, JQ] Hunan Normal Univ, Dept Phys, Changsha 410081, Hunan, Peoples R China; [Liao, JQ] Chinese Acad Sci, Inst Theoret Phys, Beijing 100190, Peoples R China
英文摘要: We study analytically the dynamic behaviours of quantum correlation measured by a quantum discord between two uncoupled qubits, which are immersed in a common Ohmic environment. We show that the quantum discord of the two non-interacting qubits can be greatly amplified or protected for certain initially prepared X-type states in the time evolution. In particular, it is found that stable amplification of the quantum discord exists for the case of two identical qubits, and the quantum discord can be protected for the case of two different qubits with a large detuning. It is also indicated that in general a sudden change of the quantum discord occurs in the time evolution at a critical time point t(c), and the discord amplification and protection may occur only in the time interval 0 < t <= t(c) for certain X-type states. This sheds new light on the creation and protection of quantum correlation.
资助者: National Fundamental Research Program of China[2007CB925204]; National Natural Science Foundation of China[10775048]; Program for Changjiang Scholars and Innovative Research Team in University[IRT0964]; Hunan Provincial Education Department[08W012]
收录类别: SCI
原文出处: 查看原文
WOS记录号: WOS:000280631700021
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/5058
Appears in Collections:理论物理所1978-2010年知识产出_期刊论文

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Recommended Citation:
Yuan, Ji-Bing,Kuang, Le-Man,Liao, Jie-Qiao. Amplification of quantum discord between two uncoupled qubits in a common environment by phase decoherence[J]. JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS,2010,43(16):-.
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