Engineering and control of the entanglement for four Magnon modes inside two microwave cavities

IF 1.5 4区 物理与天体物理 Q3 OPTICS
Ziyad Imara, Khadija El Anouz, Abderrahim El Allati
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Abstract

We present a model for investigating the entanglement features of four magnon modes in four yttrium-iron-garnet spheres dispersed in two microwave cavities (each cavity containing two spheres), which are driven by a squeezed field under actual experimental conditions. Each two-magnon mode inside each cavity is coupled via a beam splitter. We solve the covariance matrix associated with the four magnons, taking into account the relevant physical parameters. To quantify the degree of entanglement, we use the logarithmic negativity measure. Our study focuses on two parts. First, we study the entanglement properties between magnon modes by modifying the system parameters, and comparing the results with those obtained when we use a single magnon in each cavity, i.e. when one of the two magnons is not coupled to the cavity. In the second part, we give a new method for enhancing and controlling entanglement between magnon modes. We analyze the case where one of the two magnons is not coupled to the cavity, which can result a significant entanglement. Indeed, this goal is met in our situation by including an effective magnon–magnon coupling into both cavities. However, at high temperatures, the entanglement is almost completely broken. It can withstand temperatures of up to hundreds of millikelvin when using an experimentally accessible two-mode squeezed source.
两个微波腔内四种马格农模式的纠缠工程与控制
我们提出了一个模型,用于研究分散在两个微波腔(每个腔包含两个球体)中的四个钇铁石榴石球体中的四个磁子模式的纠缠特征,该模型是在实际实验条件下由挤压场驱动的。每个空腔内的每个双磁子模式都通过一个分束器耦合。考虑到相关物理参数,我们求解了与四个磁子相关的协方差矩阵。为了量化纠缠程度,我们使用了对数负性测量法。我们的研究集中在两个部分。首先,我们通过修改系统参数来研究磁子模式之间的纠缠特性,并将结果与在每个空腔中使用单个磁子(即两个磁子中的一个没有耦合到空腔中)时的结果进行比较。在第二部分,我们给出了一种增强和控制磁子模式间纠缠的新方法。我们分析了两个磁子中的一个不与空腔耦合的情况,这种情况会产生显著的纠缠。事实上,通过在两个空腔中加入有效的磁子-磁子耦合,我们就能实现这一目标。然而,在高温下,这种纠缠几乎完全被打破。在使用实验可获得的双模挤压源时,它可以承受高达数百毫开尔文的温度。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
3.60
自引率
6.20%
发文量
182
审稿时长
2.8 months
期刊介绍: Published twice-monthly (24 issues per year), Journal of Physics B: Atomic, Molecular and Optical Physics covers the study of atoms, ions, molecules and clusters, and their structure and interactions with particles, photons or fields. The journal also publishes articles dealing with those aspects of spectroscopy, quantum optics and non-linear optics, laser physics, astrophysics, plasma physics, chemical physics, optical cooling and trapping and other investigations where the objects of study are the elementary atomic, ionic or molecular properties of processes.
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