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Single-photon detectors (SPDs) offer remarkable capabilities for highly-sensitive detection of electromagnetic radiation, which are crucial in applications such as radio astronomy, quantum information, and spectroscopy. To achieve high performance, state-of-the-art SPDs often rely on the photon-induced breaking of Cooper pairs in superconductors. However, extending SPD to a wider electromagnetic spectrum will require novel superconducting materials with lower carrier densities. The presumably unconventional superconductivity in magic-angle twisted bilayer graphene (MATBG) holds great promise with its unprecedentedly low carrier density of ~ 1011 cm–2 that is ~ 5 order of magnitude lower than conventional superconductors. To fully exploit these unique superconducting properties for quantum sensing, here, we demonstrate a proof-of-principle experiment to detect single near-infrared photons up to 700 mK by voltage biasing a MATBG device near its superconducting phase transition. Our work offers insights on the MATBG-photon interaction and opens new opportunities in developing novel quantum sensors based on low-carrier density graphene-based superconductors.

Rights:

• Creative Commons BY Attribution 4.0 International
  

Keyword: Moiré superconductor, single-photon detection, MATBG

Date published: 2024-09-20

Publisher: American Association for the Advancement of Science (AAAS)

Journal:

• Science Advances (ISSN: 23752548) vol. 10 issue. 38 eadp3725

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Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1126/sciadv.adp3725

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Updated at: 2025-02-23 22:46:28 +0900

Published on MDR: 2025-02-23 22:46:28 +0900