Characterizing noise in superconducting qubits is essential for improving coherence and gate performance. Conventional noise-sensing methods typically use the qubit itself as the sensor, which limits both accessible bandwidth and applicability during driven operation. Here, we measure qubit frequency noise by detecting the photon loss it induces in a coupled high-Q superconducting cavity. We use repeated midcircuit qubit measurements with postselection to separate this induced loss from intrinsic cavity decay. We validate the protocol using injected noise and show that the extracted loss scales as expected with the applied noise strength. We place an upper bound of $0.70\times {10}^3{\mathrm{rad}}^2/\mathrm{s}$ on the intrinsic qubit frequency-noise power spectral density at the cavity-qubit detuning of 508 MHz. The protocol opens access to a higher-frequency spectral window than standard qubit-based spectroscopy and may enable noise characterization during strong driving.

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• Metrology
• Open quantum systems & decoherence
• Quantum fluctuations & noise
• Quantum metrology
• Quantum optics
• Quantum sensing
• Qubits
• Superconducting devices
• Superconducting qubits
• Cavity resonators