State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai, 200062, China.
Laboratoire Kastler Brossel, UPMC-Sorbonne Universités, CNRS, ENS-PSL Research University, Collège de France, 4 Place Jussieu, 75005 Paris, France.
Sci Rep. 2017 Mar 15;7:44600. doi: 10.1038/srep44600.
We report on a high-speed temporal and spatial multiplexed single-photon counter with photon-number-resolving capability up to four photons. The infrared detector combines a fiber loop to split, delay and recombine optical pulses and a 200 MHz dual-channel single-photon detector based on InGaAs/InP avalanche photodiode. To fully characterize the photon-number-resolving capability, we perform quantum detector tomography and then reconstruct its positive-operator-valued measure and the associated Wigner functions. The result shows that, despite of the afterpulsing noise and limited system detection efficiency, this temporal and spatial multiplexed single-photon counter can already find applications for large repetition rate quantum information schemes.
我们报告了一种具有高达四光子分辨能力的高速时一空复用单光子计数器。红外探测器结合了光纤环，用于分束、延迟和再结合光脉冲，以及基于 InGaAs/InP 雪崩光电二极管的 200MHz 双通道单光子探测器。为了充分表征光子数分辨能力，我们进行了量子探测器层析成像，然后重建了它的正算子值测量和相关的维格纳函数。结果表明，尽管存在后脉冲噪声和有限的系统检测效率，但这种时一空复用单光子计数器已经可以应用于大重复率量子信息方案。
