Qubit Noise Sensing via Induced Photon Loss in a Superconducting Cavity
Researchers developed a method to measure qubit frequency noise by observing induced photon loss in a superconducting cavity. By using repeated mid-circuit measurements and post-selection, they can isolate noise effects from intrinsic cavity decay. This technique allows for characterizing qubit noise at higher frequencies than standard methods, which is crucial for understanding strongly driven quantum operations.