Conversion of entangled states with nitrogen-vacancy centers coupled to microtoroidal resonators

TL;DR

This paper presents efficient schemes for converting multi-photon GHZ states into W or Dicke states using nitrogen-vacancy centers coupled with microtoroidal resonators, leveraging single-photon processes and cross-Kerr nonlinearities.

Contribution

It introduces novel conversion schemes for multi-photon entangled states with improved success probabilities, compatible with current experimental technology.

Findings

Success probability can be increased by iteration for three- and five-photon cases.

Conversion of four-photon GHZ to W state does not require iteration.

Schemes are feasible with existing experimental setups.

Abstract

We propose efficient schemes for converting three-photon, four-photon and five-photon GHZ state to a $W$ state or Dicke state, respectively with the nitrogen-vacancy (N-V) centers via single-photon input-output process and cross-Kerr nonlinearities. The total success probability can be improved by iterating the conversion process for the case of three-photon and five-photon while it does not require iteration for converting four-photon GHZ state to a $W$ state. The analysis of feasibility shows that our scheme is feasible for current experimental technology.