Active Resonator Reset in the Nonlinear Dispersive Regime of Circuit QED
C.C. Bultink (TU Delft - QCD/DiCarlo Lab, Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre)
M. A. Rol (Kavli institute of nanoscience Delft, TU Delft - QCD/DiCarlo Lab, TU Delft - QuTech Advanced Research Centre)
T.E. O'Brien (Universiteit Leiden)
Xiang Fu (TU Delft - QuTech Advanced Research Centre, TU Delft - Computer Engineering)
B.C.S. Dikken (Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre, Student TU Delft)
C. Dickel (TU Delft - QuTech Advanced Research Centre, Kavli institute of nanoscience Delft, TU Delft - QCD/DiCarlo Lab)
R.F.L. Vermeulen (TU Delft - QuTech Advanced Research Centre, TU Delft - ALG/General, Kavli institute of nanoscience Delft)
J.C. Sterk (Topic Embedded Systems B.V., TU Delft - QuTech Advanced Research Centre, TU Delft - QCD/DiCarlo Lab)
A Bruno (Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre, TU Delft - QCD/DiCarlo Lab)
RN Schouten (TU Delft - QuTech Advanced Research Centre, TU Delft - ALG/General, Kavli institute of nanoscience Delft)
L. di Carlo (TU Delft - QuTech Advanced Research Centre, Kavli institute of nanoscience Delft, TU Delft - QCD/DiCarlo Lab, TU Delft - QN/DiCarlo Lab)
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Abstract
We present two pulse schemes to actively deplete measurement photons from a readout resonator in the nonlinear dispersive regime of circuit QED. One method uses digital feedback conditioned on the measurement outcome, while the other is unconditional. In the absence of analytic forms and symmetries to exploit in this nonlinear regime, the depletion pulses are numerically optimized using the Powell method. We speed up photon depletion by more than six inverse resonator linewidths, saving approximately 1650 ns compared to depletion by waiting. We quantify the benefit by emulating an ancilla qubit performing repeated quantum-parity checks in a repetition code. Fast depletion increases the mean number of cycles to a spurious error detection event from order 1 to 75 at a 1-μs cycle time.