Superconducting Circuit Architecture for Digital-Analog Quantum Computing

TL;DR

This paper introduces a superconducting circuit architecture optimized for digital-analog quantum computing, combining digital and analog operations to enhance efficiency and feasibility in current experimental setups.

Contribution

The paper presents a novel superconducting circuit design for DAQC that leverages magnetic flux control for efficient multi-qubit operations, reducing resource requirements.

Findings

Efficient simulation of fermion lattices using minimal analog blocks.

Feasible implementation with current superconducting circuit technology.

Enhanced performance over purely digital quantum computing methods.

Abstract

We propose a superconducting circuit architecture suitable for digital-analog quantum computing (DAQC) based on an enhanced NISQ family of nearest-neighbor interactions. DAQC makes a smart use of digital steps (single qubit rotations) and analog blocks (parametrized multiqubit operations) to outperform digital quantum computing algorithms. Our design comprises a chain of superconducting charge qubits coupled by superconducting quantum interference devices (SQUIDs). Using magnetic flux control, we can activate/deactivate exchange interactions, double excitation/de-excitations, and others. As a paradigmatic example, we present an efficient simulation of an $\ell\times h$ fermion lattice (with $2<\ell \leq h$), using only $2(2\ell+1)^2+24$ analog blocks. The proposed architecture design is feasible in current experimental setups for quantum computing with superconducting circuits, opening the door to useful quantum advantage with fewer resources.