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We propose efficient schemes for converting three-photon, four-photon andfive-photon GHZ state to a $W$ state or Dicke state, respectively with thenitrogen-vacancy (N-V) centers via single-photon input-output process andcross-Kerr nonlinearities. The total success probability can be improved byiterating the conversion process for the case of three-photon and five-photonwhile 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 forcurrent experimental technology.

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