In a passive cavity geometry, there exists a trade-off between resonant enhancement and response time, which is inherently limited by the cavity photon lifetime. We demonstrate frequency-selective, dynamic control of the photon lifetime using a silicon-nitride coupled-ring resonator. The photon lifetime is tuned by controlling an avoided mode crossing using thermo-optic tuning of the cavity resonance with integrated heaters. Using this effect, we achieve fast turn-on/off of a ${\chi ^{(3)}}$ degenerate optical parametric oscillator (DOPO) and on-chip true random number generation. Our approach allows us to overcome the $Q$-limited generation rate of a single-ring-based DOPO and offers a path toward the development of a scalable integrated high-quality entropy source for modern cryptographic systems.

中文翻译：

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用于量子随机数生成的光子寿命的动态控制

在无源腔几何结构中，谐振增强和响应时间之间存在权衡，这在本质上受到腔光子寿命的限制。我们展示了使用氮化硅耦合环谐振器对光子寿命的频率选择性动态控制。通过使用集成加热器的腔共振的热光调谐来控制避免模式交叉来调整光子寿命。使用这种效果，我们实现了${\chi ^{(3)}}$简并光学参量振荡器 (DOPO) 的快速开启/关闭和片上真随机数生成。我们的方法使我们能够克服$Q$-基于单环的 DOPO 的有限生成率，并为现代密码系统开发可扩展的集成高质量熵源提供了途径。