Photon-noise-tolerant dispersive readout of a superconducting qubit using a nonlinear Purcell filter

Yoshiki Sunada, Kenshi Yuki, Zhiling Wang +7

Residual noise photons in a readout resonator become a major source of dephasing for a superconducting qubit when the resonator is optimized for a fast, high-fidelity dispersive re…