General method for extracting the quantum efficiency of dispersive qubit readout in circuit QED
C.C. Bultink, B. Tarasinski, N. Haandbaek, S. Poletto, N. Haider, D., J. Michalak, A. Bruno, L. DiCarlo
TL;DR
This paper introduces a versatile three-step method to accurately determine the quantum efficiency of dispersive qubit readout in circuit QED, enhancing measurement precision and noise analysis.
Contribution
The paper presents a novel, robust method for extracting quantum efficiency applicable under various readout conditions in the linear regime.
Findings
Successfully extracts quantum efficiency in experimental setups
Optimally biases Josephson traveling-wave parametric amplifier
Quantifies noise contributions in the readout chain
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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Taxonomy
TopicsQuantum Information and Cryptography · Neural Networks and Reservoir Computing · Quantum Computing Algorithms and Architecture