General method for extracting the quantum efficiency of dispersive qubit readout in circuit QED

Journal article (2018)

Authors

C.C. Bultink QCD/DiCarlo Lab - QuTech Advanced Research Centre , Kavli institute of nanoscience Delft, QuTech Advanced Research Centre
B.M. Tarasinski QuTech Advanced Research Centre, QCD/DiCarlo Lab - QuTech Advanced Research Centre , Kavli institute of nanoscience Delft
N. Haandbæk Zurich Instruments AG
S. Poletto Kavli institute of nanoscience Delft, QuTech Advanced Research Centre, QCD/DiCarlo Lab - QuTech Advanced Research Centre
S.N. Haider QuTech Advanced Research Centre, BUS/General , TNO
D.J. Michalak Intel Labs
A. Bruno QCD/DiCarlo Lab - QuTech Advanced Research Centre , Kavli institute of nanoscience Delft, QuTech Advanced Research Centre
L. DiCarlo QuTech Advanced Research Centre, QCD/DiCarlo Lab - QuTech Advanced Research Centre , Kavli institute of nanoscience Delft
Research Group
QCD/DiCarlo Lab (QuTech Advanced Research Centre) (TU Delft)
Copyright: © 2018 C.C. Bultink, B.M. Tarasinski, N. Haandbæk, S. Poletto, S.N. Haider, D.J. Michalak, A. Bruno, L. DiCarlo
DOI: https://doi.org/10.1063/1.5015954
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Published Date

2018

Language

English

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Faculty

QuTech Advanced Research Centre

Department

Quantum Computing Division

Research Group

QCD/DiCarlo Lab

Abstract

We present and demonstrate a general three-step method for extracting the quantum efficiency of dispersive qubit readout in circuit QED. We use active depletion of post-measurement photons and optimal integration weight functions on two quadratures to maximize the signal-to-noise ratio of the non-steady-state homodyne measurement. We derive analytically and demonstrate experimentally that the method robustly extracts the quantum efficiency for arbitrary readout conditions in the linear regime. We use the proven method to optimally bias a Josephson traveling-wave parametric amplifier and to quantify different noise contributions in the readout amplification chain.

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