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

C. C. Bultink; B. Tarasinski; N. Haandbæk; S. Poletto; N. Haider; D. J. Michalak; A. Bruno; L. DiCarlo

doi:10.1063/1.5015954

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

C. C. Bultink, B. Tarasinski, N. Haandbæk, S. Poletto, N. Haider, D. J. Michalak, A. Bruno, L. DiCarlo

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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.

Original language	English
Article number	092601
Journal	Applied Physics Letters
Volume	112
Issue number	9
DOIs	https://doi.org/10.1063/1.5015954
Publication status	Published - 2018

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10.1063/1.5015954

1711.05336-1Accepted author manuscript, 9.36 MB

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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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AU - Tarasinski, B.

AU - Haandbæk, N.

AU - Poletto, S.

AU - Haider, N.

AU - Michalak, D. J.

AU - Bruno, A.

AU - DiCarlo, L.

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

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