Entanglement of separate nitrogen-vacancy centers coupled to a whispering-gallery mode cavity

TL;DR

This paper proposes two quantum schemes for entangling nitrogen-vacancy centers coupled to a whispering-gallery mode cavity, utilizing Raman transitions and dark state evolution, with potential for robust quantum information processing.

Contribution

It introduces novel methods for entangling NV centers using cavity QED techniques that are resilient to noise and parameter fluctuations.

Findings

Schemes are feasible with current technology.

Methods enable robust entanglement and quantum state transfer.

Approaches are tolerant to ambient noise.

Abstract

We present a quantum electrodynamical model involving nitrogen-vacancy centers coupled to a whispering-gallery mode cavity. Two schemes are considered to create W state and Bell state, respectively. One of the schemes makes use of the Raman transition with the cavity field virtually excited; The other enables the Bell state preparation and quantum information transfer by virtue of dark state evolution and adiabatic passage, which is tolerant to ambient noise and experimental parameter fluctuations. We justify our schemes by considering the experimental feasibility and challenge using currently available technology.