来自噪声多光子自旋玻色子相互作用的原子的真正非高斯纠缠光和量子相干性

Pradip Laha, P. A. Ameen Yasir, Peter van Loock
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引用次数: 0

摘要

利用纠缠和量子相干在推动量子技术发展方面发挥着核心作用。在量子光学光原子平台中,这两种基本资源通常与杰尼斯-康明斯模型描述相关联,该模型描述了光子在光学谐振器模式和两级自旋之间的相干交换。在一般的非线性自旋玻色子系统中,会有更多的光子和更多的模式参与相互作用。在此,我们考虑了这样一种概括:双模多光子杰恩斯-康明斯(MPJC)模型。我们展示了如何以最佳方式产生纠缠和量子相干,并随后在实验可及的参数区进行操纵。对这一模型的详细比较分析表明,MPJC 相互作用中的非线性会从嘈杂的资源中产生真正的非高斯纠缠,没有高斯贡献。更具体地说,强相干源可能会被较弱的非相干源取代,从而显著降低资源开销,但代价是效率降低。同时,增加 MPJC 相互作用的多光子阶数可加快纠缠生成过程,从而使整个生成方案更加高效和稳健。我们进一步探索了额外的色散自旋玻色子相互作用和克尔非线性的使用,以分别从非相干源产生自旋相干性和增强量子相关性。至于后者,有点出乎意料的是,量子相关性并不一定会因为增强的非线性而增加。针对 MPJC 模型的可能应用,我们展示了如何通过适当选择实验参数,设计出任意的 NOON 状态以及三方 W 状态。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Genuine non-Gaussian entanglement of light and quantum coherence for an atom from noisy multiphoton spin-boson interactions

Genuine non-Gaussian entanglement of light and quantum coherence for an atom from noisy multiphoton spin-boson interactions
Harnessing entanglement and quantum coherence plays a central role in advancing quantum technologies. In quantum optical light-atom platforms, these two fundamental resources are often associated with a Jaynes-Cummings model description describing the coherent exchange of a photon between an optical resonator mode and a two-level spin. In a generic nonlinear spin-boson system, more photons and more modes will take part in the interactions. Here we consider such a generalization: the two-mode multiphoton Jaynes-Cummings (MPJC) model. We demonstrate how entanglement and quantum coherence can be optimally generated and subsequently manipulated in experimentally accessible parameter regimes. A detailed comparative analysis of this model reveals that nonlinearities within the MPJC interactions produce genuinely non-Gaussian entanglement, devoid of Gaussian contributions, from noisy resources. More specifically, strong coherent sources may be replaced by weaker, incoherent ones, significantly reducing the resource overhead, though at the expense of reduced efficiency. At the same time, increasing the multiphoton order of the MPJC interactions expedites the entanglement generation process, thus rendering the whole generation scheme again more efficient and robust. We further explore the use of additional dispersive spin-boson interactions and Kerr nonlinearities in order to create spin coherence solely from incoherent sources and to enhance the quantum correlations, respectively. As for the latter, somewhat unexpectedly, there is not necessarily an increase in quantum correlations due to the augmented nonlinearity. Towards possible applications of the MPJC model, we show how, with appropriately chosen experimental parameters, we can engineer arbitrary NOON states as well as the tripartite W state.
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