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arXiv 2104.04178quant-ph
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通过光子封锁实现按需预示单光子源

Towards On-Demand Heralded Single-Photon Sources via Photon Blockade

Jiangshan Tang, Lei Tang, Haodong Wu, Yang Wu, Hui Sun, Han Zhang, Tao Li, Yanqing Lu, Min Xiao, Keyu Xia

摘要:

激光泵浦非线性光学介质中的自发参量下转换(SPDC)可以产生高纯度但产额很低的单光子。通过增加SPDC中的泵浦功率来提高产率不可避免地由于多光子事件的激发而降低纯度。我们提出了一个方案,以克服这种纯度-产量的权衡,通过抑制多光子事件的腔增强的SPDC通过光子封锁效应。通过在腔内介质中引入强的光子-光子相互作用并增加泵浦功率,我们可以将可用的单光子产率提高到大于$90\%$,同时保持高纯度的$99\%$,朝向通过SPDC过程按需产生单光子。我们的准按需SPDC源可能会促进基于单光子的量子信息技术。

英文摘要:

Spontaneous parametric down-conversion (SPDC) in a laser pumped optical nonlinear medium can produce heralded single photons with a high purity but a very low yield. Improving the yield by increasing the pump power in SPDC inevitably reduces the purity due to excitation of multi-photon events. We propose a scheme to overcome this purity-yield trade-off by suppressing multi-photon events in a cavity-enhanced SPDC via the photon blockade effect. By introducing a strong photon-photon interaction into the intracavity medium and increasing the pump power, we can improve the available single-photon yield to larger than $90\%$, while maintaining a high purity of $99\%$, towards on-demand generation of single photons through the SPDC process. Our quasi-on-demand SPDC sources may boost single-photon-based quantum information technology.

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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