Coincidence detection of spatially correlated photon pairs with a monolithic time-resolving detector array

Abstract

We demonstrate coincidence measurements of spatially entangled photons by means of a novel type of multi-pixel based detection array. The adopted sensor is a fully digital 8$\times$16 silicon photomultiplier array allowing not only photon counting but also per-pixel time stamping of the arrived photons with a resolution of 65 ps. Together with a frame rate of 500 kfps, this property exceeds the capabilities of conventional charge-coupled device cameras which have become of growing interest for the detection of transversely correlated photon pairs. The sensor is used to measure a second-order correlation function for various non-collinear configurations of entangled photons generated by spontaneous parametric down-conversion. The experimental results are compared to theory.

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• Determination of any pure spatial qudits from a minimum number of measurements by phase stepping interferometry
• Enhanced discrimination of high-dimensional quantum states by concatenated optimal measurement strategies
• Strongly correlated multi-electron bunches from interaction with quantum light
• Spectrally Resolved Higher Order Photon Statistics of Spontaneous Parametric Down Conversion
• Advances in Position-Momentum Entanglement: A Versatile Tool for Quantum Technologies