Pushing photon-pair generation rate in microresonators by Q factor manipulation

Nuo Chen; Zijie Wang; Jingpeng Wu; Hanghang Li; Shiqi He; Zhuang Fan; Yunru Fan; Xinliang Zhang; Qiang Zhou; Qiang Zhou; Jing Xu; Jing Xu

doi:10.1364/OL.498828

Optics Letters
Vol. 48,
Issue 20,
pp. 5355-5358
(2023)
•https://doi.org/10.1364/OL.498828

Pushing photon-pair generation rate in microresonators by Q factor manipulation

Nuo Chen, Zijie Wang, Jingpeng Wu, Hanghang Li, Shiqi He, Zhuang Fan, Yunru Fan, Xinliang Zhang, Qiang Zhou, and Jing Xu

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Nuo Chen, Zijie Wang, Jingpeng Wu, Hanghang Li, Shiqi He, Zhuang Fan, Yunru Fan, Xinliang Zhang, Qiang Zhou, and Jing Xu, "Pushing photon-pair generation rate in microresonators by Q factor manipulation," Opt. Lett. 48, 5355-5358 (2023)

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Abstract

Photon pairs generated by employing spontaneous nonlinear effects in microresonators are critically essential for integrated optical quantum information technologies, such as quantum computation and quantum cryptography. Microresonators featuring high-quality (Q) factors can offer simple yet power-efficient means to generate photon pairs, thanks to the intracavity field enhancement. In microresonators, it is known that the photon-pair generation rate (PGR) is roughly proportional to the cubic power of the Q factor. However, the upper limit on PGR is also set by the Q factor: a higher Q factor brings a longer photon lifetime, which in turn leads to a lower repetition rate allowing for photon flow emitted from the microresonator, constrained by the Fourier-transform limit. Exceeding this limit will result in the overlap of photon wave packets in the time domain, thus degrading the quantum character of single-photon light beams. To push the limit of PGR in a single resonator, we propose a method by harnessing the resonance linewidth-manipulated microresonators to improve the maximum achievable photon repetition rate while keeping the power efficiency. The maximum achievable PGR and power efficiency are thus balanced by leveraging the combination of low and high-Q resonances.

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Data underlying the results presented in this paper are available from the corresponding author upon reasonable request.

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Case	(i)	(ii)	(iii)	(iv)
$Q_{i n t}$	$4 \times 10^{6}$	$4 \times 10^{6}$	$4 \times 10^{6}$	$6.08 \times 10^{4}$
$Q_{p}$	$2 \times 10^{6}$	$2 \times 10^{6}$	$3.04 \times 10^{4}$	$3.04 \times 10^{4}$
$Q_{e, p}$	$4 \times 10^{6}$	$4 \times 10^{6}$	$3.06 \times 10^{4}$	$6.08 \times 10^{4}$
$Q_{s / i}$	$2 \times 10^{6}$	$3.04 \times 10^{4}$	$3.04 \times 10^{4}$	$3.04 \times 10^{4}$
$Q_{e, s / i}$	$4 \times 10^{6}$	$3.06 \times 10^{4}$	$3.06 \times 10^{4}$	$6.08 \times 10^{4}$

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