Connections of Coherent Information, Quantum Discord, and Entanglement

被引：5
作者：
Fu Hui-Juan [1 ]
Li Jun-Gang [1 ]
Zou Jian [1 ]
Shao Bin [1 ]
机构：
[1] Beijing Inst Technol, Sch Phys, Beijing 100081, Peoples R China
来源：
COMMUNICATIONS IN THEORETICAL PHYSICS | 2012年 / 57卷 / 04期
基金：
美国国家科学基金会;
关键词：
coherent information; quantum discord; entanglement; CONTINUOUS VARIABLE SYSTEMS; SEPARABILITY CRITERION; 2; QUBITS; EVOLUTION; CHANNELS;
D O I：
10.1088/0253-6102/57/4/12
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
For a pure non-markovian dephasing model we derive analytic expressions of coherent information, quantum discord, and entanglement. We find that for the cases of the initial Werner states, the dynamical behavior of coherent information is similar to that of quantum discord but different from that of entanglement. Coherent information, as well as quantum discord, can reveal the quantum correlations in some mixed-states, in which the entanglement is zero.
引用
收藏
页码：589 / 594
页数：6
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