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

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 mod...

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Bibliographic Details
Published in:Physical review letters 2006-03, Vol.96 (12), p.127003-127003, Article 127003
Main Authors: Lupaşcu, A, Driessen, E F C, Roschier, L, Harmans, C J P M, Mooij, J E
Format: Article
Language:English
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Summary: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.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.96.127003