Enhancing the sensitivity of single microwave photon detection with bandwidth tunability

Louis Pallegoix; Jaime Travesedo; Alexandre S. May; Léo Balembois; Denis Vion; Patrice Bertet; Emmanuel Flurin

doi:10.1103/dbqj-qld5

Enhancing the sensitivity of single microwave photon detection with bandwidth tunability

Quantum Physics 2026-04-28 v2

Authors: Louis Pallegoix , Jaime Travesedo , Alexandre S. May , Léo Balembois , Denis Vion , Patrice Bertet , Emmanuel Flurin

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Abstract

We report on the characteristics of a microwave photon counter device based on a superconducting transmon qubit. Its design is similar to [arXiv:2307.03614], with an additional bandwidth tuning circuit that allows optimizing the device efficiency and noise. Owing to this new feature and to improvements in device fabrication, a power sensitivity of $3 \cdot 10^{-23} \mathrm{W}/\sqrt{\mathrm{Hz}}$ is reached. We confirm the high performance of the device by measuring single spin microwave fluorescence.

Keywords

microwave photon detection superconducting transmon qubit bandwidth tuning power sensitivity single spin fluorescence

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@article{arxiv.2501.07354,
  title  = {Enhancing the sensitivity of single microwave photon detection with bandwidth tunability},
  author = {Louis Pallegoix and Jaime Travesedo and Alexandre S. May and Léo Balembois and Denis Vion and Patrice Bertet and Emmanuel Flurin},
  journal= {arXiv preprint arXiv:2501.07354},
  year   = {2026}
}

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12 pages, 10 figures

Enhancing the sensitivity of single microwave photon detection with bandwidth tunability

Abstract

Keywords

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