Multiuser Time-Energy Entanglement Swapping Based on Dense Wavelength Division Multiplexed and Sum-Frequency Generation
Multiuser Time-Energy Entanglement Swapping Based on Dense Wavelength Division Multiplexed and Sum-Frequency Generation
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基于密集波分复用和和频生成的多用户时间能量纠缠交换
DOI：
10.1103/physrevlett.123.250505
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发表时间：
2019-12-20
影响因子：
8.6
通讯作者：
Chen, Xianfeng
中科院分区：
文献类型：
--
作者：
Li, Yuanhua;Huang, Yiwen;Chen, Xianfeng
利用非线性光学技术实现完全纠缠交换，不需要后选择，为实现大规模量子网络提供了一条重要途径。我们在实验中探索了一个基于纠缠交换的密集波分复用网络。四个用户分别接收不同波长的单量子态，并基于和频产生进行时间-能量纠缠交换操作，使用户在网络中完全连通。结果表明，纠缠态的保真度大于90%，且与用户数无关。我们的信证明了所提出的多用户网络的可行性，从而为各种量子应用铺平了道路，包括基于纠缠交换的量子直接通信。
Perfect entanglement swapping, which can be realized without the postselection by using the nonlinear optical technology, provides an important way toward generating the large-scale quantum network. We explore an entanglement-swapping-based dense wavelength division multiplexed network in the experiment. Four users receive single quantum states at different wavelengths, and we perform a time-energy entanglement swapping operation based on the sum-frequency generation to make users fully connected in the network. The results show that the fidelity of the entangled state is larger than 90% and is independent of the number of users. Our Letter demonstrates the feasibility of a proposed multiuser network, and hence paves a route toward a variety of quantum applications, including entanglement-swapping-based quantum direct communication.