量子电子学报, 2013, 30 (6): 731, 网络出版: 2013-12-04
相移控制下XX自旋链中的量子态传递
Quantum state transfer in XX spin chain with phase shift control
量子光学 量子态传递 相移控制 纠缠 保真度 自旋链 quantum optics quantum state transfer phase shift control entanglement fidelity spin chain
摘要
研究了由Aharonov-Casher相互作用产生的相移对XX自旋链中量子态传递的影响。 对信道的纠缠度及传递量子态的保真度进行数值模拟后发现,控制相移的方法可以有效抵抗信 道的消相干作用,显著提高自旋链中量子比特间的纠缠度及量子态的保真度。此外,量子态发 送端与接收端之间相对位置的不同也会影响纠缠度和保真度的大小,在包含偶数个自旋格点的 环形自旋链中,当发送端与接收端处在直径上相对的位置时,接收端的纠缠度和量子态传递的保真度可以达到最大值。
Abstract
The effect of phase shift generated by Aharonov-Casher interaction on the quantum state transfer in a XX spin chain was investigated. The concurrence of the channel and fidelity of the state were calculated by numerical simulations. It was found that by controlling the phase shift, decoherence was suppressed, and the entanglement and fidelity can be enhanced. In addition, the relative positions between the sender and receiver have influence on the entanglement and fidelity. When they are located at diametrically opposite sites in an even spin ring respectively, the maximum values of entanglement and fidelity can be obtained.
张忠军, 史鹏, 李文东, 顾永建. 相移控制下XX自旋链中的量子态传递[J]. 量子电子学报, 2013, 30(6): 731. ZHANG Zhong-jun, SHI Peng, LI Wen-dong, GU Yong-jian. Quantum state transfer in XX spin chain with phase shift control[J]. Chinese Journal of Quantum Electronics, 2013, 30(6): 731.