Phonon induced two-mode squeezing of nitrogen-vacancy center ensembles

TL;DR

This paper proposes a practical scheme to generate two-mode squeezed states between distant nitrogen-vacancy center ensembles using tunable phonon-spin interactions and phonon tunneling in diamond nanoresonators, with analysis of realistic conditions.

Contribution

It introduces a novel method leveraging phonon-mediated interactions for entangling remote NV center ensembles, including detailed dynamics analysis under realistic decay conditions.

Findings

Successful excitation transfer and two-mode squeezing demonstrated

Optimal squeezing conditions identified considering mechanical decay

Analytical and numerical methods validate the scheme's feasibility

Abstract

We propose a potentially practical scheme for realization of two-mode squeezed state with respect to two distant nitrogen-vacancy center ensembles coupled to two interconnected mechanical modes of diamond nanoresonators. By making use of the tunable phonon-spin interaction and the engineered phonon-phonon tunneling, both the desired excitation transfer process and the optimal two-mode squeezing between spin ensembles can be realized. We investigate the dynamics of the total system under infulences from the mechanical decay using both analytical and numerical methods, where the realistic conditions that leads to optimized squeezing between spin ensembles are analyzed.