Single phonon source based on a giant acoustic nonlinear effect

TL;DR

This paper introduces a novel single phonon source utilizing giant acoustic nonlinearities in NV centers within a diamond phononic crystal, enabling controlled phonon emission through strong coupling and optical driving.

Contribution

It proposes a new method to generate single phonons using NV centers with enhanced nonlinearities, advancing quantum phononics technology.

Findings

Achieved giant resonantly enhanced acoustic nonlinearities with zero linear susceptibility.

Numerically demonstrated the feasibility of single phonon generation via $g^{(2)}(0)$ calculations.

Analyzed effects of thermal noise and external driving on phonon source performance.

Abstract

We propose a single phonon source based on nitrogen-vacancy (NV) centers, which are located in a diamond phononic crystal resonator. The strain in the lattice would induce the coupling between the NV centers and the phonon mode. The strong coupling between the excited state of the NV centers and the phonon is realized by adding an optical laser driving. This four level NV centers system exhibits the coherent population trapping (CPT), and yields giant resonantly enhanced acoustic nonlinearities, with zero linear susceptibility. Based on this nonlinearity, the single phonon source can be realized. We numerically calculate $g^{(2)}(0)$ of the single phonon source. We discuss the effects of the thermal noise and the external driving strength.