High-Fidelity Hot Gates for Generic Spin-Resonator Systems
  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. 
Martin J. A. Schuetz, Geza Giedke, Lieven M. K. Vandersypen, J.   Ignacio Cirac
quant-ph cond-mat.mes-hall