A transmon molecule with nonlinear cosφ coupling achieves 99.21% readout fidelity at 89 photons and remains QND with less than 4% errors up to 300 photons, with a theoretical critical photon number of 377.
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High-power readout of a transmon qubit using a nonlinear coupling
A transmon molecule with nonlinear cosφ coupling achieves 99.21% readout fidelity at 89 photons and remains QND with less than 4% errors up to 300 photons, with a theoretical critical photon number of 377.