Dispersive Qubit Readout with Intrinsic Resonator Reset
Journal article, 2026
Measurement and readout speed impose limits for logical qubit and qudit performance in quantum computing. Here, we experimentally demonstrate a universal analytical method for designing bandwidthefficient dispersive readout pulses that intrinsically reset the resonator and extend it to multiple quantum states. The approach is based on universal analytical pulses and requires knowledge of the qubit and resonator parameters, but needs no direct optimization of the pulse shape, even when accounting for the nonlinearity of the system. When correcting for the Kerr nonlinearity, we find even more precise solutions to the speed-versus-photon-number trade-off, achieving 102 photon readout with reset to 10-2 within 3 kappa-1 duration and amplifier efficiency- and T1-limited assignment error around 0.6%. Results on qubits and qutrits validate the approach.
Author
M. Jerger
Jülich Research Centre
F. Motzoi
Jülich Research Centre
University of Cologne
Y. Gao
RWTH Aachen University
C. Dickel
University of Cologne
L. Buchmann
Aarhus University
Andreas Bengtsson
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Technology
Giovanna Sammarco Tancredi
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Technology
Christopher Warren
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Technology
Jonas Bylander
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Technology
D. DiVincenzo
Jülich Research Centre
R. Barends
RWTH Aachen University
P. A. Bushev
Jülich Research Centre
PRX QUANTUM
2691-3399 (eISSN)
Vol. 7 3 033042Subject Categories (SSIF 2025)
Condensed Matter Physics
Other Physics Topics
DOI
10.1103/z5x1-2mr9