Active Resonator Reset in the Nonlinear Dispersive Regime of Circuit QED

C. C. Bultink, M. A. Rol, T. E. O’Brien, X. Fu, B. C. S. Dikken, C. Dickel, R. F. L. Vermeulen, J. C. de Sterke, A. Bruno, R. N. Schouten, and L. DiCarlo
Phys. Rev. Applied 6, 034008 – Published 13 September 2016

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 1μs cycle time.

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  • Received 13 April 2016

DOI:https://doi.org/10.1103/PhysRevApplied.6.034008

© 2016 American Physical Society

Physics Subject Headings (PhySH)

Quantum Information, Science & Technology

Authors & Affiliations

C. C. Bultink1,2, M. A. Rol1,2, T. E. O’Brien3, X. Fu1, B. C. S. Dikken1,2, C. Dickel1,2, R. F. L. Vermeulen1,2, J. C. de Sterke4,1, A. Bruno1,2, R. N. Schouten1,2, and L. DiCarlo1,2

  • 1QuTech, Delft University of Technology, P.O. Box 5046, 2600 GA Delft, The Netherlands
  • 2Kavli Institute of Nanoscience, Delft University of Technology, P.O. Box 5046, 2600 GA Delft, The Netherlands
  • 3Instituut-Lorentz for Theoretical Physics, Leiden University, P.O. Box 9506, NL-2300 RA Leiden, The Netherlands
  • 4Topic Embedded Systems B.V., P.O. Box 440, 5680 AK Best, The Netherlands

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Issue

Vol. 6, Iss. 3 — September 2016

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