Photon-number-resolving detectors (PNRDs) play pivotal roles in many quantum-photonic applications; and intrinsic and multiplexed PNRDs have been reported previously. However, for intrinsic PNRDs, the maximum resolvable photon number is limited to a few photons; for the multiplexed PNRDs, the fidelity generally decreases when the to-be-resolved photon number goes large. Here, to resolve more photons with high fidelity, we report on a combined PNRDs, based on a spatial multiplexing configuration of multiple elements, each capable of resolving a few photons. After setting up a model and calculating the fidelity, we propose a possible physical system to realize the combined PNRDs. The proposed detectors are based on the superconducting nanowire multi-photon detectors integrated with current reservoirs that we recently reported, but are designed and configured into PNRDs. Specifically, the information of the detected photon numbers is stored in the format of the supercurrent in the current reservoir and then read out by an integrated yTron. We present in detail the operating principle and show a design that can resolve up to 11 photons with high fidelity.

中文翻译：

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集成有电流容器的超导纳米线光子数解析探测器

光子数分辨检测器（PNRD）在许多量子光子应用中起着关键作用。先前已经报道了本征和多重PNRD。但是，对于本征PNRD，最大可分辨光子数限制为几个光子。对于多路复用的PNRD，当待解析的光子数变大时，保真度通常会降低。在这里，为了以高保真度解析更多的光子，我们报告了基于多个元素的空间复用配置的组合PNRD，每个元素都能够解析几个光子。建立模型并计算保真度后，我们提出了一个可能的物理系统来实现组合的PNRD。拟议中的探测器基于我们最近报道的与储流器集成的超导纳米线多光子探测器，但已设计并配置为PNRD。具体地，将检测到的光子数的信息以超电流的形式存储在电流存储器中，然后通过集成的yTron读出。我们详细介绍了工作原理，并展示了一种可解析多达11个高保真度光子的设计。