Quantum-classical interface based on single flux quantum digital logic

R. McDermott, M. G. Vavilov, Britton Plourde, F. K. Wilhelm, P. J. Liebermann, O. A. Mukhanov, T. A. Ohki

Research output: Contribution to journalArticle

27 Scopus citations


We describe an approach to the integrated control and measurement of a large-scale superconducting multiqubit array comprising up to 108 physical qubits using a proximal coprocessor based on the Single Flux Quantum (SFQ) digital logic family. Coherent control is realized by irradiating the qubits directly with classical bitstreams derived from optimal control theory. Qubit measurement is performed by a Josephson photon counter, which provides access to the classical result of projective quantum measurement at the millikelvin stage. We analyze the power budget and physical footprint of the SFQ coprocessor and discuss challenges and opportunities associated with this approach.

Original languageEnglish (US)
Article number024004
JournalQuantum Science and Technology
Issue number2
StatePublished - Apr 1 2018



  • single flux quantum logic
  • superconducting qubits
  • surface code

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Physics and Astronomy (miscellaneous)
  • Electrical and Electronic Engineering
  • Materials Science (miscellaneous)

Cite this

McDermott, R., Vavilov, M. G., Plourde, B., Wilhelm, F. K., Liebermann, P. J., Mukhanov, O. A., & Ohki, T. A. (2018). Quantum-classical interface based on single flux quantum digital logic. Quantum Science and Technology, 3(2), [024004]. https://doi.org/10.1088/2058-9565/aaa3a0