Catch-Disperse-Release Readout for Superconducting Qubits
Eyob A. Sete, Andrei Galiautdinov, Eric Mlinar, John M. Martinis, Alexander N. Korotkov
DOI 10.1103/PhysRevLett.110.210501 · Physical Review Letters
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Abstract
We analyze a single-shot readout for superconducting qubits via the controlled catch, dispersion, and release of a microwave field. A tunable coupler is used to decouple the microwave resonator from the transmission line during the dispersive qubit-resonator interaction, thus circumventing damping from the Purcell effect. We show that, if the qubit frequency tuning is sufficiently adiabatic, a fast high-fidelity qubit readout is possible, even in the strongly nonlinear dispersive regime. Interestingly, the Jaynes-Cummings nonlinearity leads to the quadrature squeezing of the resonator field below the standard quantum limit, resulting in a significant decrease of the measurement error.
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