An elementary tripartite quantum communication network for discrete variables is proposed. In this network three nodes are quantum wired with quantum channel created by a pair of Greenberger–Horne–Zeilinger (GHZ) triplet. We show that in this network by local operations and classical communication an arbitrary two-qubit state can be deterministically teleported from any node to any other node. In this network tripartite teleportation of two-qubit state is achieved by first splitting the qubit into fragments and then at the destination, qubit is re-constructed from the fragments. A high flux source for generation of fully inseparable GHZ photonic quantum channel required for developing an ideal tripartite quantum network is presented. This GHZ source employ a group velocity matched periodically poled potassium titanyl phosphate crystal in pulsed polarization Sagnac interferometer configuration and is based on selecting a three-photon entangled state from the product state of an entangled photon pair and a weak coherent state. This GHZ source generates tripartite entangled photons at telecom wavelength (1584 nm). Genuine entanglement in the generated GHZ state is detected with a witness (W) operator. Complete detail of the experimental apparatus required for developing an ideal tripartite quantum communication photonic network, which employ fully inseparable quantum channel, is presented. This quantum network fully operates at wavelength 1584 nm, which occurs in the L-band of the technologically important third telecom window. Success probability for teleportation of two-qubit photonic state within the tripartite quantum network is determined. We show that such quantum network is experimentally feasible. Experimental procedure to unambiguously verify the teleportation of an arbitrary two-qubit photonic state within the network is discussed. It is shown that our scheme can be implemented in a programmed teleportation system and it paves the way towards a large-scale quantum network.

提出了一种用于离散变量的基本三方量子通信网络。在这个网络中，三个节点与由一对 Greenberger-Horne-Zeilinger (GHZ) 三元组创建的量子通道进行量子连接。我们表明，在该网络中，通过本地操作和经典通信，可以确定地将任意两个量子位状态从任何节点传送到任何其他节点。在这个网络中，双量子位状态的三方隐形传态是通过首先将量子位分裂成片段，然后在目的地，从片段中重新构建量子位来实现的。提出了一种高通量源，用于生成开发理想的三方量子网络所需的完全不可分离的 GHZ 光子量子通道。该 GHZ 源在脉冲偏振 Sagnac 干涉仪配置中采用群速度匹配的周期性极化磷酸氧钛钾晶体，并基于从纠缠光子对和弱相干态的产物状态中选择三光子纠缠态。该 GHZ 源在电信波长 (1584 nm) 下产生三重纠缠光子。生成的 GHZ 状态中的真正纠缠是用见证人检测到的（W ) 运算符。介绍了开发理想的三方量子通信光子网络所需的实验装置的完整细节，该网络采用完全不可分离的量子通道。该量子网络完全在波长 1584 nm 下运行，该波长出现在具有技术重要性的第三个电信窗口的 L 波段。确定了三方量子网络内两量子位光子态隐形传态的成功概率。我们表明这种量子网络在实验上是可行的。讨论了明确验证网络内任意两量子位光子状态的隐形传态的实验程序。结果表明，我们的方案可以在程序化的隐形传态系统中实现，并为大规模量子网络铺平了道路。