Transmon ionization (TI) is detrimental to qubit coherence and manipulation. This study explores how TI, triggered by strong microwave pulses, affects microwave single-photon detectors (SPDs) based on a 3D multimode cavity coupled to a transmon qubit. Experimental and numerical investigations reveal that at a critical pump power transmon population suddenly increases, indicating a quantum-to- classical transition. The authors also outline the challenges and potential solutions for increasing the quantum efficiency of SPDs, being crucial for advancing quantum communication and sensing technologies.
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Nojiri et al. (2024) studied this question.
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