Enhancing the entanglement of a teleported state by local collective noises

被引:1
作者
Hu, Xueyuan [1 ]
Gu, Ying [1 ]
Gong, Qihuang [1 ]
Guo, Guangcan [1 ,2 ]
机构
[1] Peking Univ, State Key Lab Mesoscop Phys, Dept Phys, Beijing 100871, Peoples R China
[2] Univ Sci & Technol China, Key Lab Quantum Informat, Hefei 230026, Peoples R China
基金
中国国家自然科学基金;
关键词
QUANTUM; QUBITS;
D O I
10.1088/0953-4075/44/7/075504
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
We show that the entanglement of the two-qubit teleported state via a class of four-qubit entangled channel states can be increased by collective amplitude damping locally acting on one part of the channel state. Specifically, we compare the entanglement contained in the output state of teleportation before and after the action of the collective amplitude damping on the channel state, and show that for a wide range of input entangled two-qubit states, the local decoherence can result in an increase in the output entanglement. In this process, the average fidelity of the teleportation is also increased. Our result reveals that some quantum properties of the four-qubit channel state are definitely improved in the process of enhancing the fidelity by local noise.
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页数:6
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