Review of Biphoton Sources Based on the Double- Λ $\Lambda$ Spontaneous Four-Wave Mixing Process

IF 4.4 Q1 OPTICS
Jia-Mou Chen, Thorsten Peters, Pei-Hsuan Hsieh, Ite A. Yu
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Abstract

This review article focuses on biphoton sources based on the double- Λ $\Lambda$ spontaneous four-wave mixing (SFWM) process in laser-cooled as well as room-temperature or hot atomic ensembles. These biphoton sources have the advantage of providing stable frequencies, ultranarrow linewidths, and a tunability of the temporal biphoton width of more than one order of magnitude for high-bandwidth applications. Therefore, the generated photons can be efficiently interfaced to, e.g., atomic quantum memories. In contrast, solid-state biphoton sources typically require assistance by an optical cavity to operate at narrow linewidth that limits the tunability of the temporal width of the biphotons. Present state-of-the-art double- Λ $\Lambda$ SFWM biphoton sources can achieve one of the following results: a spectral linewidth of 50 kHz (290 kHz) or a temporal width of 13  μ s $\umu {\rm s}$ (580 ns) with cold (hot) atoms, a detection rate of about 7 × 10 3 $\times 10^3$ cps, and a generation rate of 10 7 $10^7$ cps at a duty cycle of 0.4% or of 10 5 $10^5$ cps in the steady state. The theoretical background of these biphoton sources, experimental implementations with cold and hot atoms, and progress over the years, will be illustrated.

Abstract Image

基于双Λ$\Lambda$自发四波混合过程的双光子源综述
这篇综述文章的重点是基于激光冷却以及室温或热原子集合中双自发四波混合(SFWM)过程的双光子源。这些双光子源的优点是频率稳定、线宽超窄,而且双光子的时间宽度可调,超过高带宽应用的一个数量级。因此,产生的光子可以有效地与原子量子存储器等连接。相比之下,固态双光子源通常需要光腔的辅助才能在窄线宽下工作,这就限制了双光子时宽的可调谐性。目前最先进的双 SFWM 双光子源可以达到以下结果之一:光谱线宽为 50 kHz(290 kHz),或冷原子(热原子)的时间宽度为 13(580 ns),探测率约为 7 cps,在占空比为 0.4% 时产生率为 cps,或在稳定状态下产生率为 cps。我们将说明这些双光子源的理论背景、冷原子和热原子的实验实施情况以及多年来取得的进展。
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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CiteScore
7.90
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