Characterization of space-momentum entangled photon with a time resolving CMOS SPAD array

Abstract

Single photon avalanche diode arrays can provide both the spatial and temporal information of each detected photon. We present here the characterization of entangled light with a sensor specifically designed for quantum imaging applications. The sensors is time-tagging each detection events at the 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. We show the ability of the sensor to characterize space-momentum entangled photon pairs emitted by spontaneous parametric downconversion. Their entanglement is demonstrated by violating an EPR-type inequality.

15 pages, 12 figures

References in corpus (4)

• Imaging with quantum states of light
• Imaging high-dimensional spatial entanglement with a camera
• Quantum correlation measurement with single photon avalanche diode arrays
• Tuning curve of type-0 spontaneous parametric down-conversion

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• A quantum-enhanced wide-field phase imager
• Advances in Position-Momentum Entanglement: A Versatile Tool for Quantum Technologies