Time-division technique for quantum optical receivers utilizing single-photon detector array technology and spatial-multiplexing

Alfonso Tello Castillo*, Ross Donaldson

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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Abstract

Free-space quantum key distribution (QKD) has been gaining popularity in recent years due to its advantages in creating networking options for the quantum internet. One of the main challenges to be addressed in QKD is the achievable secret key rate, which must meet current and future demand. Some of the existing solutions include the use of higher bandwidth electronics, untrusted relay architectures such as Twin-Field QKD, or high dimensional QKD. In this work, we proposed the use of a combination of spatial-multiplexing and time-division techniques, together with the use of 2D single-photon avalanche diode arrays to increase the final throughput. The main challenge in a free-space scenario is the effects introduced by turbulence. This paper demonstrates how appropriate time-division of the spatial-modes can reduce the quantum bit error rate due to optical crosstalk from 36% to 0%. With this technique, we believe the future need for superconducting nanowires single photon detectors, in some free-space QKD applications, can be relaxed, obtaining more cost-effective receiver systems.

Original languageEnglish
Pages (from-to)44365-44374
Number of pages10
JournalOptics Express
Volume30
Issue number25
Early online date22 Nov 2022
DOIs
Publication statusPublished - 5 Dec 2022

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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