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Dispersive detection of single microwave photons with quantum dots

Stephanie Matern1, Alberto Biella1,2, Pasquale Scarlino3,4, Iacopo Carusotto1,2, and Gianluca Rastelli1,2,*

  • *Contact author: gianluca.rastelli@ino.cnr.it
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Phys. Rev. Research 8, 033034 – Published 9 July, 2026

DOI: https://doi.org/10.1103/4dmz-t4c3

Abstract

Within a circuit quantum electrodynamics architecture, we theoretically investigate the detection of a single propagating microwave photon traveling through a resonant microwave cavity dispersively interacting with a double quantum dot tunnel coupled to a lead. Under suitable conditions, a single photon in the cavity can induce a measurable change in the electronic occupation of the charge states. We develop a quantum cascade approach that enables a time-resolved description of a single-photon wave packet impinging on the cavity. We make use of a simple model of charge detector to assess the efficiency of our photo-detection configuration as functions of key parameters such as coupling strength, tunneling rate, temperature, and photon resonance linewidth. We finally highlight a measurement-induced backaction effect on the cavity mode associated with the dispersive, nonabsorptive detection process.

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Phys. Rev. Research 8, 033034– Published 9 July, 2026
  • Received 26 November 2025
  • Accepted 8 June 2026
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