Integrate and scale: A source of spectrally separable photon pairs
Integrate and scale: A source of spectrally separable photon pairs
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DOI：
10.1364/optica.491965
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发表时间：
2023-03
期刊：
影响因子：
10.4
通讯作者：
Ben M. Burridge;I. Faruque;J. Rarity;J. Barreto
中科院分区：
文献类型：
--
作者：
Ben M. Burridge;I. Faruque;J. Rarity;J. Barreto
集成光子学是容错量子计算机竞赛中的有力竞争者，声称是一个能够扩展到必要数量量子位的平台。这就需要使用高质量的量子态，我们在这里使用集成光子平台上的全方位高性能光子源来创建量子态。我们使用光子分子架构和宽带定向耦合器来防止制造公差并确保可靠的操作。因此，我们同时测量的光谱纯度为99.1\pm 0.1 $%，对产生率为4.4\pm 0.1 $MHz mW $^{-2}$，和一个内在的源预示效率为94.0\pm 2.9 $%。我们还看到最大巧合与意外比率为$1644\pm 263 $。我们声称在源预示效率，纯度和亮度之间的三变量权衡的数量级的改善。该源的未来实现可以使用最先进的传播损耗实现超过99 $%的纯度和预示效率。
Integrated photonics is a powerful contender in the race for a fault-tolerant quantum computer, claiming to be a platform capable of scaling to the necessary number of qubits. This necessitates the use of high-quality quantum states, which we create here using an all-around high-performing photon source on an integrated photonics platform. We use a photonic molecule architecture and broadband directional couplers to protect against fabrication tolerances and ensure reliable operation. As a result, we simultaneously measure a spectral purity of $99.1 \pm 0.1$ %, a pair generation rate of $4.4 \pm 0.1$ MHz mW$^{-2}$, and an intrinsic source heralding efficiency of $94.0 \pm 2.9$ %. We also see a maximum coincidence-to-accidental ratio of $1644 \pm 263$. We claim over an order of magnitude improvement in the trivariate trade-off between source heralding efficiency, purity and brightness. Future implementations of the source could achieve in excess of $99$ % purity and heralding efficiency using state-of-the-art propagation losses.