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arXiv 1601.06173quant-ph
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亚兆赫单光子源

Sub-Megahertz Single Photon Source

Markus Rambach, Aleksandrina Nikolova, Till J. Weinhold, Andrew G. White

摘要:

我们报告100%占空比产生的亚MHz的单光子对在铷D $_1$线使用腔增强的自发参数下转换。时间强度互相关函数对于单光子表现出$666 \pm 16$ kHz的带宽,低于目标跃迁的自然线宽一个数量级。腔内半波片有助于实现泵浦光、信号光和闲频光的三重共振,降低了带宽,简化了锁定方案。此外,腔体对泵浦频率的稳定使得能够实现100%占空比。这些光子非常适合存储在具有亚自然线宽的量子存储器方案中,例如梯度回波存储器。

英文摘要:

We report 100% duty cycle generation of sub-MHz single photon pairs at the Rubidium D$_1$ line using cavity-enhanced spontaneous parametric downconversion. The temporal intensity crosscorrelation function exhibits a bandwidth of $666 \pm 16$ kHz for the single photons, an order of magnitude below the natural linewidth of the target transition. A half-wave plate inside our cavity helps to achieve triple resonance between pump, signal and idler photon, reducing the bandwidth and simplifying the locking scheme. Additionally, stabilisation of the cavity to the pump frequency enables the 100% duty cycle. These photons are well-suited for storage in quantum memory schemes with sub-natural linewidths, such as gradient echo memories.

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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