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arXiv 2104.09098quant-phphysics.optics
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腔级联双光子态的光谱压缩和纠缠缩减

Spectral compression and entanglement reduction in the cascaded biphoton state with cavities

Y. -E Wong, N. -Y. Tsai, W. S. Hiew, H. H. Jen

摘要:

由冷原子系综产生的级联双光子态是保存和传递量子信息的强关联源之一。在四波混频条件下,从上下激发态发射的信号光子和闲频光子在传播方向上高度相关,并在连续的频率空间中纠缠。在该系统中,我们从理论上研究了利用外腔对双光子源的光谱压缩,并证明了其频率纠缠熵的降低。这分别表明,改善的光吸收效率的闲频光子以及几乎纯的双光子源,这是有用的光量子网络。我们进一步调查的限制,可以通过使用多个腔实现的光谱压缩。我们的研究结果显示了具有外腔的双光子源的能力和潜力,其中基于原子的量子存储器的性能可以得到增强,并且可以通过定制光谱压缩来操纵纠缠特性。

英文摘要:

The cascaded biphoton state generated from a cold atomic ensemble presents one of the strongly correlated resources that can preserve and relay quantum information. Under the four-wave mixing condition, the emitted signal and idler photons from the upper and lower excited states become highly correlated in their traveling directions and entangled in continuous frequency spaces. In this system, we theoretically study the spectral compression of the biphoton source using an external cavity and show the reduction in its frequency entanglement entropy. This indicates, respectively, an improved light absorption efficiency for the idler photon as well as an almost pure biphoton source which is useful in optical quantum networks. We further investigate the limit of the spectral compression that can be achieved by using multiple cavities. Our results show the capability and potential of the biphoton source with external cavities, where the performance of atom-based quantum memory can be enhanced and the entanglement property can be manipulated by tailoring the spectral compression.

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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