High-contrast dispersive readout of a superconducting flux qubit using a nonlinear resonator

Details High-contrast dispersive readout of a superconducting flux qubit using a nonlinear resonator High-contrast dispersive readout of a superconducting flux qubit using a nonlinear resonator

2006-01-27

arxiv.org/abs/cond-mat/0601634v1

Phys. Rev. Lett. 96, 127003 (2006)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

submitted to Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.96.127003

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 % 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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