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arXiv · 2511.19128

Dispersive detection of single microwave photons with quantum dots

Stephanie Matern·Alberto Biella·Pasquale Scarlino·Iacopo Carusotto·Gianluca Rastelli
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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, non-absorptive detection process.

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Stephanie Matern, Alberto Biella, Pasquale Scarlino, Iacopo Carusotto, Gianluca Rastelli. 2025-11-24. Dispersive detection of single microwave photons with quantum dots. https://doi.org/10.1103/4dmz-t4c3

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