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

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.

16 pages, 8 figures

References in corpus (16)

• Charge insensitive qubit design derived from the Cooper pair box
• Surface codes: Towards practical large-scale quantum computation
• Coupling Superconducting Qubits via a Cavity Bus
• Demonstration of Two-Qubit Algorithms with a Superconducting Quantum Processor
• Simple pulses for elimination of leakage in weakly nonlinear qubits
• Suppressing Charge Noise Decoherence in Superconducting Charge Qubits
• Detecting arbitrary quantum errors via stabilizer measurements on a sublattice of the surface code
• Quantum feedback control of a superconducting qubit: Persistent Rabi oscillations
• Observation of quantum jumps in a superconducting artificial atom
• Scalable quantum circuit and control for a superconducting surface code
• Tunable Superconducting Qubits with Flux-Independent Coherence
• Graphene-based Josephson junction single photon detector
• Two-dimensional cavity grid for scalable quantum computation with superconducting circuits
• Reading-out the state of a flux qubit by Josephson transmission line solitons
• Josephson junction microwave modulators for qubit control
• Josephson tunnel junctions with nonlinear damping for RSFQ-qubit circuit applications

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• Tunable coupling of widely separated superconducting qubits: A possible application towards a modular quantum device
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• Speeding up qubit control with bipolar single-flux-quantum pulse sequences
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• Baseband control of superconducting qubits with shared microwave drives
• Mitigating coherent leakage of superconducting qubits in a large-scale quantum socket
• Coherence-limited digital control of a superconducting qubit using a Josephson pulse generator at 3 K
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• Practical implications of SFQ-based two-qubit gates
• Cryogenic photonic link using an extended-InGaAs photodiode and short pulse illumination towards high-fidelity drive of superconducting qubits
• Cryogenic Optical-to-Microwave Conversion Using Si Photonic Integrated Circuit Ge Photodiodes
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• Controllable tunnelling of single flux-quanta mediated by quantum phase-slip in disordered superconducting loops
• Quasiparticle Dynamics in Superconducting Quantum-Classical Hybrid Circuits
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• Nonvolatile Cryogenic Phase Slip Memory with Single-Shot Readout
• Qubit Energy Tuner Based on Single Flux Quantum Circuits
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• PaST-NoC: A Packet-Switched Superconducting Temporal NoC
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• A hybrid ferromagnetic transmon qubit: circuit design, feasibility and detection protocols for magnetic fluctuations
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• On-chip microwave coherent source with in-situ control of the photon number distribution