Partially entangled states bridge in quantum teleportation

为在用部分纠缠的州的资源的一个量通讯系统的信息转移的传统的方法是量蒸馏或直接远距传物。以便减少在 hop-by-hop 传播花费并且在每个节点独立地执行的等待的时间，我们建议从来源节点与部分纠缠的状态衔接方法到 teleport 量状态到目的地节点的量。我们也证明衔接电路的设计的特定的量为越过多重中间的节点的部分纠缠的状态远距传物是可行的。比作二个传统的方法，我们的部分，纠纷量衔接方法使用更简单的逻辑门，更好的安全，和罐头处于更少的量资源状况被使用了。

Two-qubit entangled state teleportation via optimal POVM and partially entangled GHZ state

Quantum teleportation is of significant meaning in quantum information. In this paper, we study the probabilistic teleportation of a two-qubit entangled state via a partially entangled Greenberger- Horne-Zeilinger （GHZ） state when the quantum channel information is only available to the sender. We formulate it as an unambiguous state discrimination problem and derive exact optimal positive-operator valued measure （POVM） operators for maximizing the probability of unambiguous discrimination. Only one three-qubit POVM for the sender, one two-qubit unitary operation for the receiver, and two chits for outcome notification are required in this scheme. The unitary operation is given in the form of a concise formula, and the fidelity is calculated. The scheme is further extended to more general case for transmitting a two-qubit entangled state prepared in arbitrary form. We show this scheme is flexible and applicable in the hop-by-hop teleportation situation.

Quantum connectivity optimization algorithms for entanglement source deployment in a quantum multi-hop network

起初，纠纷来源推广问题在一个量多跳跃网络被学习，它在量连接上有重要影响。二个优化算法在这份报纸与有限纠纷来源一起被介绍。一个推广算法由保证那得到纠纷来源的分发范围的所有重叠区域基于节点位置(DNP ) 改进连接包含节点。另外，一个推广算法被把这个区域划分成格子基于一个改进基因算法(DIGA ) 实现。从模拟结果，分别地， DNP 和 DIGA 与随机的推广相比在 213.73% 和 248.83% 改进量连接并且后者以连接更好表现。然而， DNP 更灵活、适应变化，当所有节点什么时候被盖住，停止跑。

Routing protocol for wireless quantum multi-hop mesh backbone network based on partially entangled GHZ state

Quantum multi-hop teleportation is important in the field of quantum communication. In this study, we propose a quantum multi-hop communication model and a quantum routing protocol with multi- hop teleportation for wireless mesh backbone networks. Based on an analysis of quantum multi-hop protocols, a partially entangled Greenberger-Horne-Zeilinger （GHZ） state is selected as the quantum channel for the proposed protocol. Both quantum and classical wireless channels exist between two neighboring nodes along the route. With the proposed routing protocol, quantum information can be transmitted hop by hop from the source node to the destination node. Based on multi-hop telepor- tation based on the partially entangled GHZ state, a quantum route established with the minimum number of hops. The difference between our routing protocol and the classical one is that in the for- mer, the processes used to find a quantum route and establish quantum channel entanglement occur simultaneously. The Bell state measurement results of each hop are piggybacked to quantum route finding information. This method reduces the total number of packets and the magnitude of air inter- face delay. The deduction of the establishment of a quantum channel between source and destination is also presented here. The final success probability of quantum multi-hop teleportation in wireless mesh backbone networks was simulated and analyzed. Our research shows that quantum multi-hop teleportation in wireless mesh backbone networks through a partially entangled GHZ state is feasible.

Multiple teleportation via partially entangled GHZ state

Quantum teleportation is important for quantum comrmmication. We propose a protocol that uses a partially entangled Greenberger-Horne-Zeilinger （GHZ） state for single hop teleportation. Quantum teleportation will succeed if the sender makes a Bell state measurement, and the receiver performs the Hadamard gate operation, applies appropriate Pauli operators, introduces an auxiliary particle, and applies the corresponding unitary matrix to recover the transmitted state. We also present a protocol to realize multiple teleportation of partially entangled GHZ state without an auxiliary particle. We show that the success probability of the teleportation is Mways [） when the number of teleportat, ions is odd. In order to improve the success probability of a multihop, we introduce the method used in our single hop teleportation, thus proposing a multiple teleportation protocol using anxiliary particles and a unitary matrix. The final success probability is shown to bc improved significantly for the method without auxiliary particles fbr both an odd or even number of teleportations.

Multi-hop teleportation in a quantum network based on mesh topology

In this paper, we propose a mesh-topology-based multi-hop teleportation scheme for a quantum net- work. By using the proposed scheme, quantum communication can be realized between two arbitrary nodes, even when they do not share a direct quantum channel. Einstein-Podolsky-Rosen pairs are used as quantum channels. The source node （initial sender） and all intermediate nodes make Bell measurements independently. They send the results to the destination node （final receiver） by classical channels. The quantum state can be determined from the Bell measurement result, and only the desti- nation node is required for simple unitary transformation. This method of simultaneous measurement contributes significantly to quantum network by reducing the hop-by-hop transmission delay.