Title
General method for extracting the quantum efficiency of dispersive qubit readout in circuit QED
Author
Bultink, C.C.
Tarasinski, B.
Haandbæk, N.
Poletto, S.
Haider, N.
Michalak, D.J.
Bruno, A.
DiCarlo, L.
Publication year
2018
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. © 2018 Author(s).
Subject
Dispersion (waves)
Efficiency
Extraction
Parametric amplifiers
Quantum computers
Signal to noise ratio
Timing circuits
General method
Homodyne measurements
Noise contributions
Non steady-state
Optimal integration
Post-measurement
Traveling wave
Weight functions
Quantum efficiency
2015 Observation, Weapon & Protection Systems
RT - Radar Technology
TS - Technical Sciences
To reference this document use:
http://resolver.tudelft.nl/uuid:d520a773-6b21-42b5-b51a-f92e1543bbe3
TNO identifier
787772
ISSN
0003-6951
Source
Applied Physics Letters, 112 (112)
Document type
article