Nonlinear resonant behavior of the dispersive readout scheme for a superconducting flux qubit

Details Nonlinear resonant behavior of the dispersive readout scheme for a superconducting flux qubit Nonlinear resonant behavior of the dispersive readout scheme for a superconducting flux qubit

2006-09-22

arxiv.org/abs/cond-mat/0609561v1

Physics

Condensed Matter

Superconductivity

9 pages, 9 figures

Scientific paper

10.1103/PhysRevB.75.144505

A nonlinear resonant circuit comprising a SQUID magnetometer and a parallel capacitor is studied as a readout scheme for a persistent-current (PC) qubit. The flux state of the qubit is detected as a change in the Josephson inductance of the SQUID magnetometer, which in turn mediates a shift in the resonance frequency of the readout circuit. The nonlinearity and resulting hysteresis in the resonant behavior are characterized as a function of the power of both the input drive and the associated resonance peak response. Numerical simulations based on a phenomenological circuit model are presented which display the features of the observed nonlinearity.

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