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Fast Microwave-free State Preparation and Measurement of Superconducting Qubits
Abstract
Fast, high-fidelity, scalable state preparation and measurement is critical to the realization of a quantum computing system. The state-of-the-art methods for preparation and readout of superconducting qubits require finely tuned microwave signals and ~100 ns of measurement time, which are major obstacles to the scalability and performance of superconducting quantum computers. Here, we have demonstrated novel, microwave-free methods for both preparation and readout of superconducting qubits with >99% fidelity in only 10 ns for either operation while maintaining qubit coherence. This technology is compatible with scalable superconducting digital control systems, and using quantum flux parametrons for amplification, we demonstrated full quantum-to-digital conversion in only 15 ns, which is an order of magnitude faster than state-of-the-art microwave-based techniques.
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BibTeX
@misc{abraham2026fast,
title = {{Fast Microwave-free State Preparation and Measurement of Superconducting Qubits}},
author = {R. Abraham and F. Amet and P. Anderson and M. Arrigo and J. Arteaga and C. J. Ballard and C. Barker and T. Barnes and P. Bechmann and R. Bhatt and K. Blaine and T. M. Borman and J. Botimer and G. R. Boyd and P. Bradley and A. D. Brandon and T. K. Bristol and A. Bulkos and R. M. Burnett and D. Burrowes and D. N. Cakan and N. Carniero and T. Chamberlin and D. Chen and M. Chilcote and B. G. Christensen and I. Christie and J. Clark and D. Clarke and J. M. Cochran and J. C. Collini and K. Connolly and G. Costa and D. Cowger and B. Dalfort and R. D. Dawson and D. Davies and S. Deitemeyer and N. DeNigris and F. Densmore and S. J. Di Giacomo and S. G. Diamond and R. DiCiro and S. M. Disseler and K. Dixon and J. Donnelly and E. Donohue and M. Downing and B. Eastin and N. Edwards and M. Ehsani and S. Ellis and R. Epstein and D. Ferguson and P. Fischer and S. Friedensen and D. Gabriel and M. A. Gettelman and A. Gillam and G. Gilmore},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.01334},
eprint = {2609.01334},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.01334},
}
RIS
TY - UNPB
TI - Fast Microwave-free State Preparation and Measurement of Superconducting Qubits
AU - R. Abraham
AU - F. Amet
AU - P. Anderson
AU - M. Arrigo
AU - J. Arteaga
AU - C. J. Ballard
AU - C. Barker
AU - T. Barnes
AU - P. Bechmann
AU - R. Bhatt
AU - K. Blaine
AU - T. M. Borman
AU - J. Botimer
AU - G. R. Boyd
AU - P. Bradley
AU - A. D. Brandon
AU - T. K. Bristol
AU - A. Bulkos
AU - R. M. Burnett
AU - D. Burrowes
AU - D. N. Cakan
AU - N. Carniero
AU - T. Chamberlin
AU - D. Chen
AU - M. Chilcote
AU - B. G. Christensen
AU - I. Christie
AU - J. Clark
AU - D. Clarke
AU - J. M. Cochran
AU - J. C. Collini
AU - K. Connolly
AU - G. Costa
AU - D. Cowger
AU - B. Dalfort
AU - R. D. Dawson
AU - D. Davies
AU - S. Deitemeyer
AU - N. DeNigris
AU - F. Densmore
AU - S. J. Di Giacomo
AU - S. G. Diamond
AU - R. DiCiro
AU - S. M. Disseler
AU - K. Dixon
AU - J. Donnelly
AU - E. Donohue
AU - M. Downing
AU - B. Eastin
AU - N. Edwards
AU - M. Ehsani
AU - S. Ellis
AU - R. Epstein
AU - D. Ferguson
AU - P. Fischer
AU - S. Friedensen
AU - D. Gabriel
AU - M. A. Gettelman
AU - A. Gillam
AU - G. Gilmore
PY - 2026
DA - 2026/09/01
PB - arXiv
DO - 10.48550/arxiv.2609.01334
UR - https://arxiv.org/abs/2609.01334
AB - Fast, high-fidelity, scalable state preparation and measurement is critical to the realization of a quantum computing system. The state-of-the-art methods for preparation and readout of superconducting qubits require finely tuned microwave signals and ~100 ns of measurement time, which are major obstacles to the scalability and performance of superconducting quantum computers. Here, we have demonstrated novel, microwave-free methods for both preparation and readout of superconducting qubits with >99% fidelity in only 10 ns for either operation while maintaining qubit coherence. This technology is compatible with scalable superconducting digital control systems, and using quantum flux parametrons for amplification, we demonstrated full quantum-to-digital conversion in only 15 ns, which is an order of magnitude faster than state-of-the-art microwave-based techniques.
ER -