High-Contrast Dispersive Readout of a Superconducting Flux Qubit Using a Nonlinear Resonator
A. Lupaşcu, E. F. C. Driessen, L. Roschier, C. J. P. M. Harmans, J. E. Mooij
DOI 10.1103/PhysRevLett.96.127003 · Physical Review Letters
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Abstract
We demonstrate high-contrast state detection of a superconducting flux qubit. Detection is realized by probing the microwave transmission of a nonlinear resonator, based on a SQUID. Depending on the driving strength of the resonator, the detector can be operated in the monostable or the bistable mode. The bistable operation combines high-sensitivity with intrinsic latching. The measured contrast of Rabi oscillations is as high as 87%; of the missing 13%, only 3% of the loss of contrast is unaccounted for. Experiments involving two consecutive detection pulses are consistent with preparation of the qubit state by the first measurement.
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