Counterfactual entanglement distribution using quantum dot spins

• DOI: 10.1364/josab.33.000663
• Publication Date: 2016-03-19T00:19:39Z
• Authors: Yuanyuan Chen; Dong Jiang; Xuemei Gu; Ling Xie; Lijun Chen
• Keywords: 0103 physical sciences; 01 natural sciences

Counterfactual quantum communication allows distant users to share a message without any physical particles traveling through the quantum channel. Here, we present a counterfactual scheme to realize multiparty entanglement distribution. We first realize bipartite counterfactual entanglement distribution to create photon–electron entanglement by using interaction-free measurements and quantum dots. Then the atom–cavity systems are used to create many photon–photon entanglement pairs, which can connect photon–electron pairs with the help of an entanglement beam splitter. Consequently, the electron spins in distant optical microcavities are entangled by the coherent exchange of single flying photons. We also discuss the implementation issues to show that the presented scheme can be realized successfully in experiment. The numerical analysis about the efficiency of multiparty entanglement distribution indicates that there is a trade-off between the entanglement fidelity and the number of users.