Storage of Multipartite Entanglement In Photonic Crystal
多组分纠缠在光子晶体中的存储

The fidelity evolution of multipartite entangled coherent state of excitons, in anisotropic band gap photonic crystal, was investigated analytically and numerically. The influences of the exciton transition frequency, the relative phase, the density of exciton and the number of QD on the evolution behaviors of fidelity was discussed extensively. The results show that the fidelity oscillates with scaled time if the exciton transition frequency lies in the photonic band gap, which is different from that of quantum dots in free vacuum. And the multipartite entangled coherent state of excitons could be efficiently preserved in photonic crystal if the detuning of exciton transition frequency with respect to the photonic band edge is relatively large.