Distributed wireless quantum communication networks with partially entangled pairs＊Distributed wireless quantum communication networks with partially entangled pairs＊Distributed wireless quantum communication networks with partially entangled pairs＊Distributed wireless quantum communication networks with partially entangled pairs

Wireless quantum communication networks transfer quantum state by teleportation. Existing research focuses on maximal entangled pairs. In this paper, we analyse the distributed wireless quantum communication networks with partially entangled pairs. A quantum routing scheme with multi-hop teleportation is proposed. With the proposed scheme, is not necessary for the quantum path to be consistent with the classical path. The quantum path and its associated classical path are established in a distributed way. Direct multi-hop teleportation is conducted on the selected path to transfer a quantum state from the source to the destination. Based on the feature of multi-hop teleportation using partially entangled pairs, if the node number of the quantum path is even, the destination node will add another teleportation at itself. We simulated the performance of distributed wireless quantum communication networks with a partially entangled state. The probability of transferring the quantum state successfully is statistically analyzed. Our work shows that multi-hop teleportation on distributed wireless quantum networks with partially entangled pairs is feasible,     

用于多信道无线网络的综合链路速率分配算法

This paper presents a link allocation and rate assignment algorithm for multi-channel wireless networks. The objective is to reduce network conflicts and guarantee the fairness among links. We first design a new network model. With this network model, the multi-channel wireless network is divided into several subnets according to the number of channels. Based on this, we present a link allocation algorithm with time complexity O(l2 ) to allocate all links to subnets. This link allocation algorithm adopts conflict matrix to minimize the network contention factor. After all links are allocated to subnets, the rate assignment algorithm to maximize a fairness utility in each subnet is presented. The rate assignment algorithm adopts a near-optimal algorithm based on dual decomposition and realizes in a distributed way. Simulation results demonstrate that, compared with IEEE 802. 11b and slotted seeded channel hopping algorithm, our algorithm decreases network conflicts and improves the network throughput significantly.     

Distributed wireless quantum communication networks with partially entangled pairs

Wireless quantum communication networks transfer quantum state by teleportation. Existing research focuses on maximal entangled pairs. In this paper, we analyse the distributed wireless quantum communication networks with partially entangled pairs. A quantum routing scheme with multi-hop teleportation is proposed. With the proposed scheme, is not necessary for the quantum path to be consistent with the classical path. The quantum path and its associated classical path are established in a distributed way. Direct multi-hop teleportation is conducted on the selected path to transfer a quantum state from the source to the destination. Based on the feature of multi-hop teleportation using partially entangled pairs, if the node number of the quantum path is even, the destination node will add another teleportation at itself. We simulated the performance of distributed wireless quantum communication networks with a partially entangled state. The probability of transferring the quantum state successfully is statistically analyzed. Our work shows that multi-hop teleportation on distributed wireless quantum networks with partially entangled pairs is feasible.     

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Distributed wireless quantum communication networks

The distributed wireless quantum communication network （DWQCN） ha~ a distributed network topology and trans- mits information by quantum states. In this paper, we present the concept of the DWQCN and propose a system scheme to transfer quantum states in the DWQCN. The system scheme for transmitting information between any two nodes in the DWQCN includes a routing protocol and a scheme for transferring quantum states. The routing protocol is on-demand and the routing metric is selected based on the number of entangled particle pairs. After setting up a route, quantum tele- portation and entanglement swapping are used for transferring quantum states. Entanglement swapping is achieved along with the process of routing set up and the acknowledgment packet transmission. The measurement results of each entan- glement swapping are piggybacked with route reply packets or acknowledgment packets. After entanglement swapping, a direct quantum link between source and destination is set up and quantum states are transferred by quantum teleportation. Adopting this scheme, the measurement results of entanglement swapping do not need to be transmitted specially, which decreases the wireless transmission cost and transmission delay.     

一种新的均衡流量提高网络能量效率的Ad hoc网络路由建立算法

能量问题是Ad hoc网络中的一个重要问题,该文提出了通过均衡流量提高网络能量效率的TBDB路由建立算法。该算法在路由建立时对可选的路径集合进行限制,根据节点在饱和状态时归一化吞吐量的值,分别设定链路层队列中数据长度的门限值和节点连接度的门限值,收到路由请求的节点,根据门限值和节点的当前状况对节点是否响应收到的路由请求做出判决,从而调节了网络中节点的负荷,均衡了网络中能量的消耗,避免节点长期处于重负荷状态,保证了当前正在进行的传输。分析和仿真表明该算法在均衡流量的同时,也将网络中能量的消耗均衡地分散于网络各个部分,改进了网络的性能。仿真结果表明该路由算法提高了网络的吞吐率和能量效率,并且降低了平均端到端的延时。     

一种均衡流量的Mobile Ad Hoc网络能量路由选择方法

由于Ad hoc网络是能量受限网络,因此如何提高Ad hoc网络的能量效率问题非常重要。该文提出了一种新的路由选择度量,该度量把节点链路层的拥塞度与节点当前剩余能量综合在一起考虑,使得网络中能量消耗和网络负荷能更加均匀地分布,提高了网络的连通性,增加了网络的吞吐量。仿真结果表明,该度量对于不同规模的网络,其吞吐量均有不同程度的提高。     

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