Mediator assisted cooling in quantum annealing

TL;DR

This paper demonstrates that using bosonic modes to mediate interactions in quantum annealers significantly reduces errors and enhances qubit coherence, especially in the ultrastrong coupling regime, with potential benefits for various quantum computing architectures.

Contribution

It introduces a mediator-assisted approach in quantum annealing that leverages bosonic modes to mitigate errors and improve coherence, supported by numerical simulations and theoretical analysis.

Findings

Error reduction in quantum annealers with bosonic mediators

Increased qubit coherence in mediated interaction architectures

Error mitigation applicable to broader quantum computing systems

Abstract

We show a significant reduction of errors for an architecture of quantum annealers (QA) where bosonic modes mediate the interaction between qubits. These systems have a large redundancy in the subspace of solutions, supported by arbitrarily large bosonic occupations. We explain how this redundancy leads to a mitigation of errors when the bosonic modes operate in the ultrastrong coupling regime. Numerical simulations also predict a large increase of qubit coherence for a specific annealing problem with mediated interactions. We provide evidences that noise reduction occurs in more general types of quantum computers with similar architectures.