Adiabatic quantum computation with Rydberg-dressed atoms

TL;DR

This paper proposes a realistic architecture for adiabatic quantum computation using Rydberg-dressed neutral atoms, demonstrating high-fidelity two-qubit operations for solving QUBO problems.

Contribution

It introduces a detailed atomic implementation scheme for adiabatic quantum computing with Rydberg-dressed atoms, including fidelity analysis and practical considerations.

Findings

Two-qubit fidelity around 0.99 considering photon scattering

Effective implementation of Rydberg-dressed interactions for quantum optimization

Potential for improved fidelities with better laser sources

Abstract

We study an architecture for implementing adiabatic quantum computation with trapped neutral atoms. Ground state atoms are dressed by laser fields in a manner conditional on the Rydberg blockade mechanism, thereby providing the requisite entangling interactions. As a benchmark we study the performance of a Quadratic Unconstrained Binary Optimization (QUBO) problem whose solution is found in the ground state spin configuration of an Ising-like model. We model a realistic architecture, including details of the atomic implementation, with qubits encoded into the clock states of 133Cs, effective B-fields implemented through stimulated Raman transitions, and atom-atom coupling achieved by excitation to the 100P3/2 Rydberg level. Including the fundamental effects of photon scattering, we find the fidelity of two-qubit implementation to be on the order of 0.99, with higher fidelities possible with improved laser sources.