Distributed Quantum Computing and Network Control for Accelerated VQE

TL;DR

This paper proposes methods for distributing the accelerated variational quantum eigensolver (AVQE) across multiple quantum computers and introduces a distributed quantum control architecture to enhance large-scale quantum computations.

Contribution

It introduces a systematic approach for distributing quantum algorithms and circuits, and proposes a distributed quantum control system architecture for networked quantum computing.

Findings

Systematic method for distributing AVQE across quantum computers

Framework for parallelized qubit assignment in quantum chemistry

Architecture for centralized and decentralized quantum network control

Abstract

Interconnecting small quantum computers will be essential in the future for creating large scale, robust quantum computers. Methods for distributing monolithic quantum algorithms efficiently are thus needed. In this work we consider an approach for distributing the accelerated variational quantum eigensolver (AVQE) algorithm over arbitrary sized - in terms of number of qubits - distributed quantum computers. We consider approaches for distributing qubit assignments of the Ansatz states required to estimate the expectation value of Hamiltonian operators in quantum chemistry in a parallelized computation and provide a systematic approach to generate distributed quantum circuits for distributed quantum computing. Moreover, we propose an architecture for a distributed quantum control system in the settings of centralized and decentralized network control.