Real-time entangled photon-pair imaging towards field deployment

Robin Camphausen; Álvaro Cuevas; Alexander Demuth; Iris Cusini; Francesca Madonini; Federica Villa; Alessandro Ruggeri; Adrià Sansa Perna; Markus Gräfe; Fabian Steinlechner; Valerio Pruneri

doi:10.1117/12.2691076

30 November 2023 Real-time entangled photon-pair imaging towards field deployment

Robin Camphausen, Álvaro Cuevas, Alexander Demuth, Iris Cusini, Francesca Madonini, Federica Villa, Alessandro Ruggeri, Adrià Sansa Perna, Markus Gräfe, Fabian Steinlechner, Valerio Pruneri

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Proceedings Volume 12795, Quantum Technology: Driving Commercialisation of an Enabling Science IV; 1279502 (2023) https://doi.org/10.1117/12.2691076
Event: SPIE Photonex, 2023, Glasgow, United Kingdom

Abstract

Quantum technology promises improvements in imaging, computing, and communication, for example using the resource of entanglement between photons with spatial correlations. Detecting spatial correlations, or coincidences, between entangled photons scalably, efficiently, and affordably is therefore an essential capability. However, this task is non-trivial for existing camera technologies, which require low illumination intensities or low detection duty cycles to count coincidences at high signal-to-noise ratios, resulting in long acquisition time, or use expensive custom electronic components. Here, we present an entanglement imaging system based around a novel Single-Photon Avalanche Diode (SPAD) array camera, optimized for sparse illumination with correlated photon pairs. The system is capable of maintaining a duty cycle close to 100%, while simultaneously detecting spatially resolved coincidences with high SNR, enabling the acquisition of real-time entanglement videos at a ~Hz frame rate. We use our system to demonstrate real-time monitoring of entanglement interference visibility, optical system point spread function, as well as real-time widefield entanglement-enhanced phase imaging. Our results show that SPAD array cameras represent a natural choice for scalable entanglement detection and imaging applications.

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Robin Camphausen, Álvaro Cuevas, Alexander Demuth, Iris Cusini, Francesca Madonini, Federica Villa, Alessandro Ruggeri, Adrià Sansa Perna, Markus Gräfe, Fabian Steinlechner, and Valerio Pruneri "Real-time entangled photon-pair imaging towards field deployment", Proc. SPIE 12795, Quantum Technology: Driving Commercialisation of an Enabling Science IV, 1279502 (30 November 2023); https://doi.org/10.1117/12.2691076

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KEYWORDS

Quantum entanglement

Cameras

Single photon avalanche diodes

Quantum imaging

Point spread functions

Imaging systems

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