High-Fidelity Hot Gates for Generic Spin-Resonator Systems

TL;DR

This paper introduces a high-fidelity, non-perturbative hot gate for spin-resonator systems that enables coherent spin-spin interactions even with thermally populated resonator modes, applicable across various physical platforms.

Contribution

The authors present a novel hot gate scheme that works with thermal resonator modes and is compatible with multiple physical implementations, verified through numerical fidelity analysis.

Findings

High fidelity entanglement achievable in thermally populated systems

Applicable to circuit-QED, surface acoustic wave, and nanomechanical resonators

Numerical verification confirms robustness under realistic conditions

Abstract

We propose and analyze a high-fidelity hot gate for generic spin-resonator systems which allows for coherent spin-spin coupling, in the presence of a thermally populated resonator mode. Our scheme is non-perturbative, applies to a broad class of physical systems, including for example spins coupled to circuit-QED and surface acoustic wave resonators as well as nanomechanical oscillators, and can be implemented readily with state-of-the-art experimental setups. We provide and numerically verify simple expressions for the fidelity of creating maximally entangled states under realistic conditions.