Quantum--Classical Interface Based on Single Flux Quantum Digital Logic

2017/10/12 by R. McDermott, M. G. Vavilov, B. L. T. Plourde +4 · 2 citations
Physics and Astronomy · #quant-ph

paper · pdf · doi:10.1088/2058-9565/aaa3a0

published as Quantum Sci. Technol. 3, 024004 (2018) · 16 pages, 8 figures

arxiv created 2017/10/12 · arxiv updated 2018/03/20

Abstract

We describe an approach to the integrated control and measurement of a large-scale superconducting multiqubit circuit 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.

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