Eckmann Bruno, Bessire Bänz, Unternährer Manuel, Gasparini Leonardo, Perenzoni Matteo, Stefanov André
Opt Express. 2020 Oct 12;28(21):31553-31571. doi: 10.1364/OE.401260.
Single-photon avalanche diode arrays can provide both the spatial and temporal information of each detected photon. We present here the characterization of spatially entangled photons with a 32 × 32 pixel sensor, specifically designed for quantum imaging applications. The sensor is time-tagging each detection event at pixel level with sub-nanosecond accuracy within frames of 50 ns. The spatial correlations between any number of detections in a defined temporal window can thus be directly extracted from the data.The space-momentum entanglement of photon pairs is demonstrated by violating an EPR-type inequality directly from the measured near-field correlations and far-field anti-correlations.
单光子雪崩二极管阵列能够提供每个探测光子的空间和时间信息。我们在此展示了使用专门为量子成像应用设计的32×32像素传感器对空间纠缠光子的表征。该传感器在50纳秒的帧内以亚纳秒精度在像素级别对每个探测事件进行时间标记。因此，可以直接从数据中提取定义时间窗口内任意数量探测之间的空间相关性。通过直接从测量的近场相关性和远场反相关性违反EPR型不等式，证明了光子对的空间-动量纠缠。
