arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1903.02484cond-mat.mes-hallphysics.opticsquant-ph
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腔冷却增强反铁磁振子-磁振子纠缠

Enhancement of antiferromagnetic magnon-magnon entanglement by cavity cooling

H. Y. Yuan, Shasha Zheng, Zbigniew Ficek, Q. Y. He, Man-Hong Yung

摘要:

磁振子-光子耦合已经在实验中实现,而腔自旋电子学由于其与量子信息科学的潜在对接而引起了人们的极大关注。然而,人们很少知道这种耦合是否意味着磁振子和光子之间的纠缠态,这对于它在量子信息中的应用至关重要。研究了反铁磁光系统中磁振子与光子之间的纠缠特性,发现磁振子与光子之间的纠缠几乎为零,而磁振子-磁振子之间的纠缠很强,通过与腔光子的耦合可以进一步增强。当反铁磁物质与光共振时,会出现最大的增强。在强纠缠的联合真空附近,磁振子-磁振子态的腔诱导冷却现象可以很好地解释其基本物理过程。我们的研究结果对于将腔自旋电子学扩展到量子操纵领域具有重要意义,并进一步提供了一种操纵连续变量纠缠的强关联的方法,该方法具有一般的稳定条件和易调谐性.

英文摘要:

Magnon-photon coupling has been experimentally realized inside a cavity and the emerging field known as cavity spintronics has attracted significant attention for its potential docking with quantum information science. However, one seldom knows whether this coupling implies an entanglement state among magnons and photons or not, which is crucial for its usage in quantum information. Here we study the entanglement properties among magnons and photons in an antiferromagnet-light system and find that the entanglement between magnon and photon is nearly zero while the magnon-magnon entanglement is very strong and it can be even further enhanced through the coupling with the cavity photons. The maximum enhancement occurs when the antiferromagnet reaches resonant with the light. The essential physics can be well understood within the picture of cavity induced cooling of magnon-magnon state near its joint vacuum with stronger entanglement. Our results are significant to extend the cavity spintronics to quantum manipulation and further provide an alternate to manipulate the deep strong correlations of continuous variable entanglement with a generic stable condition and easy tunability.

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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