Role of relaxation in the quantum measurement of a superconducting qubit using a nonlinear oscillator
T. Picot, A. Lupaşcu, S. Saito, C. J. P. M. Harmans, J. E. Mooij
DOI 10.1103/PhysRevB.78.132508 · Physical Review B
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Abstract
We analyze the relaxation of a superconducting flux qubit during measurement. The qubit state is measured with a nonlinear oscillator driven across the threshold of bifurcation, acting as a switching dispersive detector. This readout scheme is of quantum nondemolition type. Two successive readouts are used to analyze the evolution of the qubit and the detector during the measurement. We introduce a simple transition rate model for characterizing the qubit relaxation and the detector switching process. Corrected for qubit relaxation the readout fidelity is at least 95%. Qubit relaxation strongly depends on the driving strength and the state of the oscillator.
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