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We describe an approach to the integrated control and measurement of alarge-scale superconducting multiqubit circuit using a proximal coprocessorbased on the Single Flux Quantum (SFQ) digital logic family. Coherent controlis realized by irradiating the qubits directly with classical bitstreamsderived from optimal control theory. Qubit measurement is performed by aJosephson photon counter, which provides access to the classical result ofprojective quantum measurement at the millikelvin stage. We analyze the powerbudget and physical footprint of the SFQ coprocessor and discuss challenges andopportunities associated with this approach.

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