Low-crosstalk bifurcation detectors for coupled flux qubits
de Groot, P. C. · van Loo, A. F. · Lisenfeld, J. · Schouten, R. N. · Lupascu, A. · Harmans, C. J. P. M. · Mooij, J. E.
Original · EN
We present experimental results on the crosstalk between two AC-operated dispersive bifurcation detectors, implemented in a circuit for high-fidelity readout of two strongly coupled flux qubits. Both phase-dependent and phase-independent contributions to the crosstalk are analyzed. For proper tuning of the phase the measured crosstalk is 0.1 % and the correlation between the measurement outcomes is less than 0.05 %. These results show that bifurcative readout provides a reliable and generic approach for multi-partite correlation experiments.
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