Multipartite Entanglement Preparation and Quantum Communication with Atomic Ensembles

Feng Zhao

张军 Zhang Jun, 韩 超 HAN Chao

Peng Xue, Guang‐Can Guo

Xiaobin Huang, Ye‐Hong Chen, Zhe Wang

Feng Zhao

We propose an efficient scheme to prepare multipartite entanglement of atomic ensembles trapped in separate cavities. Our scheme has high fidelity even with realistic noise based on the repeat-until-success strategy. By employing the quantum memory of the atomic internal state, the scaling efficiency decreases only with the number of atomic ensembles by a slow polynomial law. Moreover, the atomic ensembles also can function as quantum repeaters, which enable our system to compatible with the current experimental technique for quantum communication using atomic ensembles.

Chao Han, Peng Xue, Guang‐Can Guo

We propose an experimentally feasible scheme to generate Greenberger-Horne-Zeilinger type of maximal entanglement among three atomic ensembles, and show one of the applications, controlled secure direct communication. The scheme involves laser manipulation of atomic ensembles, quarter- and half-wave plates, beam splitters, polarizing beam splitters, and single-photon detectors, which are within the reach of current experimental technology.