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arXiv 1909.09653cond-mat.mes-hall
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各向异性磁体中压缩磁振子调谐纠缠

Tuning entanglement by squeezing magnons in anisotropic magnets

Ji Zou, Se Kwon Kim, Yaroslav Tserkovnyak

摘要:

本文从理论上研究了在外加磁场和轴向各向异性的情况下,磁振子自然形成一般压缩相干态的磁性材料中两个任意自旋之间的纠缠。利用纠缠度作为纠缠度的度量,我们证明了自旋通常在热力学平衡下纠缠,纠缠量由外场和各向异性控制。结果,磁介质可以用作存储和处理量子信息的资源。我们还发现,当外加磁场减小时,纠缠会发生不连续的跳跃。这种可调纠缠可以潜在地用作量子信息处理任务中的有效开关。

英文摘要:

We theoretically study the entanglement between two arbitrary spins in a magnetic material, where magnons naturally form a general squeezed coherent state, in the presence of an applied magnetic field and axial anisotropies. Employing concurrence as a measure of entanglement, we demonstrate that spins are generally entangled in thermodynamic equilibrium, with the amount of entanglement controlled by the external fields and anisotropies. As a result, the magnetic medium can serve as a resource to store and process quantum information. We, furthermore, show that the entanglement can jump discontinuously when decreasing the applied magnetic field. This tunable entanglement can be potentially used as an efficient switch in quantum-information processing tasks.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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