Fast Microwave-free State Preparation and Measurement of Superconducting Qubits

arXiv:2609.01334v1 Announce Type: new 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.

Authors:R. Abraham, F. Amet, P. Anderson, M. Arrigo, J. Arteaga, C. J. Ballard, C. Barker, T. Barnes, P. Bechman, R. Bhatt, K. Blaine, T. M. Borman, J. Botimer, G. R. Boyd, P. Bradley, A. D. Brandon, T. K. Bristol, A. Bulkos, R. M. Burnett, D. Burrowes, D. N. Cakan, N. Carniero, T. Chamberlin, D. Chen, M. Chilcote, B. G. Christensen, I. Christie, J. Clark, D. Clarke, J. M. Cochran, J. C. Collini, K. Connolly, G. Costa, D. Cowger, B. Dalfort, D. Davies, S. Deitemeyer, N. DeNigris, F. Densmore, S. J. Di Giacomo, S. G. Diamond, R. DiCiro, S. M. Disseler, K. Dixon, J. Donnelly, E. Donohue, M. Downing, B. Eastin, N. Edwards, M. Ehsani, S. Ellis, R. Epstein, D. Ferguson, P. Fischer, S. Friedensen, D. Gabriel, M. A. Gettelman, A. Gillam, G. Gilmore, J. Goode, E. Goodwin, M. Gottschalk, A. L. Graninger, T. Graves-Abe, J. Hackley, N. Hartman, B. Heacock, B. Heischmidt, P. Helms, R. Hinkey, B. Hong, S. T. Howard, D. Jensen, N. Johns, D. R. Johnson, J. Johnson, H. Kaplan, Z. Keane, S. Keebaugh, C. Kegerreis, K. Kelcourse-Oquendo, M. S. Khalil, D. Killeen, A. S. Knutson, T. Kohler, M. Kornecki, F. Koutsouli, A. Krick, K. L. Krycka, J. Kuan, D. Lad, J. R. Lane, N. J. Laurita, A. C. Lee, A. R. Lemmon, E. M. Leonard, L. M. D. Leonard, J. Leventis, M. P. Lilly, A. Lisewski

et al. (114 additional authors not shown)

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.

arXiv:2609.01334 [quant-ph]

(or arXiv:2609.01334v1 [quant-ph] for this version)

https://doi.org/10.48550/arXiv.2609.01334 arXiv-issued DOI via DataCite (pending registration)

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Fast Microwave-free State Preparation and Measurement of Superconducting Qubits

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