Towards combined quantum bit detection and spatial tracking using an arrayed single-photon sensor

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Abstract

Experimental quantum key distribution through free-space channels requires accurate pointing-and-tracking to co-align telescopes for efficient transmission. The hardware requirements for the sender and receiver could be drastically reduced by combining the detection of quantum bits and spatial tracking signal using two-dimensional single-photon detector arrays. Here, we apply a two-dimensional CMOS single-photon avalanche diode detector array to measure and monitor the single-photon level interference of a free-space time-bin receiver interferometer while simultaneously tracking the spatial position of the single-photon level signal. We verify an angular field-of-view of 1.28° and demonstrate a post-processing technique to reduce background noise. The experimental results show a promising future for two-dimensional single-photon detectors in low-light level free-space communications, such as quantum communications.
Original languageEnglish
Pages (from-to)8181-8198
Number of pages18
JournalOptics Express
Volume29
Issue number6
Early online date2 Mar 2021
DOIs
Publication statusPublished - 15 Mar 2021

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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