量子光学学报, 2011, 17 (3): 168, 网络出版: 2011-07-25  

移动势阱下一维自旋链上量子态的传输

Quantum State Transfer in One-dimensional SpinChains with a Moving Potential
作者单位
南京航空航天大学理学院, 江苏 南京 211100
摘要
本文从无序能够抑制量子态的传输作为启发,验证了外加势垒的低穿透性,提出了利用外加移动势阱将量子态限制在势阱底部进行量子态传输的方案,并利用有限方势阱,余弦曲线势阱,V型势阱和抛物线曲线势阱进行了讨论和比较。可以将自旋链看做是与一定常衰减系数γ相关的衰减通道,并讨论了衰减系数和磁场强度的关系。在一定移动势阱条件下,可以得到很低的衰减系数,量子态能够进行较远距离的传输,并且在无序存在的情况下具有很强的稳定性。
Abstract
Inspired by the phenomenon that disorder can restrain quantum state transfer in spin chain, we verify the assumption that quantum state can penetrate potential barrier of a certain magnetic density with low probability. Finite square potential well, cosine potential well and parabolic potential well are discussed. Quantum state is restrained at the bottom of the moving potential well. Regarding the spin chain as a damping channel, relations between damping coefficient γ and the strength of magnetic field are studied. Low damping coefficient is obtained under a certain magnetic density. Quantum state is able to transfer a long distance with high fidelity. This scheme is robust in the presence of disorder.

邱金斗, 张永梅. 移动势阱下一维自旋链上量子态的传输[J]. 量子光学学报, 2011, 17(3): 168. QIU Jin-dou, ZHANG Yong-mei. Quantum State Transfer in One-dimensional SpinChains with a Moving Potential[J]. Acta Sinica Quantum Optica, 2011, 17(3): 168.

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