Digital Coherent Control of a Superconducting Qubit

E. Leonard, M. A. Beck, J. Nelson, B. G. Christensen, T. Thorbeck, C. Howington, A. Opremcak, I. V. Pechenezhskiy, K. Dodge, N. P. Dupuis, M. D. Hutchings, J. Ku, F. Schlenker, J. Suttle, C. Wilen, S. Zhu, M. G. Vavilov, Britton Plourde, R. McDermott

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

High-fidelity gate operations are essential to the realization of a fault-tolerant quantum computer. In addition, the physical resources required to implement gates must scale efficiently with system size. A longstanding goal of the superconducting qubit community is the tight integration of a superconducting quantum circuit with a proximal classical cryogenic control system. Here we implement coherent control of a superconducting transmon qubit using a single-flux quantum (SFQ) pulse driver cofabricated on the qubit chip. The pulse driver delivers trains of quantized flux pulses to the qubit through a weak capacitive coupling; coherent rotations of the qubit state are realized when the pulse-to-pulse timing is matched to a multiple of the qubit oscillation period. We measure the fidelity of SFQ-based gates to be approximately 95% using interleaved randomized benchmarking. Gate fidelities are limited by quasiparticle generation in the dissipative SFQ driver. We characterize the dissipative and dispersive contributions of the quasiparticle admittance and discuss mitigation strategies to suppress quasiparticle poisoning. These results open the door to integration of large-scale superconducting qubit arrays with SFQ control elements for low-latency feedback and stabilization.

Original languageEnglish (US)
Article number014009
JournalPhysical Review Applied
Volume11
Issue number1
DOIs
StatePublished - Jan 7 2019

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pulses
quantum computers
poisoning
electrical impedance
cryogenics
resources
stabilization
chips
time measurement
oscillations

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Leonard, E., Beck, M. A., Nelson, J., Christensen, B. G., Thorbeck, T., Howington, C., ... McDermott, R. (2019). Digital Coherent Control of a Superconducting Qubit. Physical Review Applied, 11(1), [014009]. https://doi.org/10.1103/PhysRevApplied.11.014009

Digital Coherent Control of a Superconducting Qubit. / Leonard, E.; Beck, M. A.; Nelson, J.; Christensen, B. G.; Thorbeck, T.; Howington, C.; Opremcak, A.; Pechenezhskiy, I. V.; Dodge, K.; Dupuis, N. P.; Hutchings, M. D.; Ku, J.; Schlenker, F.; Suttle, J.; Wilen, C.; Zhu, S.; Vavilov, M. G.; Plourde, Britton; McDermott, R.

In: Physical Review Applied, Vol. 11, No. 1, 014009, 07.01.2019.

Research output: Contribution to journalArticle

Leonard, E, Beck, MA, Nelson, J, Christensen, BG, Thorbeck, T, Howington, C, Opremcak, A, Pechenezhskiy, IV, Dodge, K, Dupuis, NP, Hutchings, MD, Ku, J, Schlenker, F, Suttle, J, Wilen, C, Zhu, S, Vavilov, MG, Plourde, B & McDermott, R 2019, 'Digital Coherent Control of a Superconducting Qubit', Physical Review Applied, vol. 11, no. 1, 014009. https://doi.org/10.1103/PhysRevApplied.11.014009
Leonard E, Beck MA, Nelson J, Christensen BG, Thorbeck T, Howington C et al. Digital Coherent Control of a Superconducting Qubit. Physical Review Applied. 2019 Jan 7;11(1). 014009. https://doi.org/10.1103/PhysRevApplied.11.014009
Leonard, E. ; Beck, M. A. ; Nelson, J. ; Christensen, B. G. ; Thorbeck, T. ; Howington, C. ; Opremcak, A. ; Pechenezhskiy, I. V. ; Dodge, K. ; Dupuis, N. P. ; Hutchings, M. D. ; Ku, J. ; Schlenker, F. ; Suttle, J. ; Wilen, C. ; Zhu, S. ; Vavilov, M. G. ; Plourde, Britton ; McDermott, R. / Digital Coherent Control of a Superconducting Qubit. In: Physical Review Applied. 2019 ; Vol. 11, No. 1.
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