In order to solve the switching problem of quantum entanglement signalling, a signalling switching strategy was proposed first. And then the signalling switching process under the circumstance that quantum terminal was connected in the same switches and different switches was analysed respectively. We simulated the throughput rate of quantum signalling switches at last. The results show that throughput rate has a close relationship with swapping measurement success rate. The quantum signalling switches throughput rates (QTR) raise exponent-liked with the raising of measurement success rate. The QTR raises as the measurement time reduce on the condition of constant measurement success rate. The measurement time therefore should be less than lus to make sure that QTR of quantum signalling is more 30Mbps.
In order to solve the switching problem of quantum entanglement signalling, a signalling switching strategy was proposed first. And then the signalling switching process under the circumstance that quantum terminal was connected in the same switches and different switches was analysed respectively. We simulated the throughput rate of quantum signalling switches at last. The results show that throughput rate has a close relationship with swapping measurement success rate. The quantum signalling switches throughput rates (QTR) raise exponent-liked with the raising of measurement success rate. The QTR raises as the measurement time reduce on the condition of constant measurement success rate. The measurement time therefore should be less than lus to make sure that QTR of quantum signalling is more 30Mbps.
Aiming at the quantum signalling repeater network model for multi-user,environment quantum noises effect on remote transmission of signalling was studied.A kind of quantum signaling repeater strategy was purposed after the theory of quantum swapping being analyzed.Then a bus network model was put forward and the success rate of long distance quantum signaling transmission was simulated.The results show that long distance signaling transmission has a close relationship with the noise power spectral density,transmission distance and repeater times.When noise power spectral density is constant and there is no repeater during the transmission process,the success rate declines like plesio-flat-parabola with increasing of the transmission distance.On the condition of constant noise power spectral density and constant transmission distance,the success rate increases obviously while the repeater times is increasing.Therefore,on the behalf of reliable quantum signaling transmission the transmission distance and repeater times should be designed properly under the circumstance of constant background noise.
In order to solve the damage problem during remote transmission of quantum signaling, a repeater model of signaling quantum is proposed. In this model, firstly purifying and distributing entanglement of the received signaling quantum state is carried out, to establish entangled channels between the signed sending and receiving. Secondly, through quantum entanglement swapping the quantum signaling is transmitted, for completing the quantum signaling relay. Simulation results show that the success rate of signaling relay can reach more than 97% under the condition that the fidelity is 0.98 and the entangled pairs successful establishing rate is 0.98; the throughput of quantum signaling relay is up to 183kbps when the probability of entanglement swapping, purification, and entangled pairs successful establishing is 0.98.
Quantum entanglement swapping can be used to establish reliable quantum remote transmission channel so as to realize transmission of quantum states. However, the highly stable quantum network is required in the quantum channels when using quantum entanglement swapping, otherwise it will waste a lot of entanglement resources. In order to save entanglement resources, we have to put forward a kind of quantum communication network transmission protocol based on packet switching, according to the theory of quantum teleportation. Firstly, the principle of packet switching in computer network is introduced. Next we describe the implementation process of quantum network transmission protocols which are based on entanglement swapping and packet switching. We then analyze the reliability, security and utilization rate of entanglement of the protocol we have proposed. And after that the quantitative relationship about the number of entanglement quantum states, the number of routers and link error rates are calculated. Finally, we compare these two transmission protocols. Simulation results show that the number of entanglement for these two protocols is equal without consideration of the link errors. When taking them into account, the packet switching transmission protocol can save numbers of entanglement resources obviously. In addition, with the increase of number of routers and the rise in link error rates, the quantum communication network transmission protocol based on packet switching will need less entanglement resources than that based on entanglement swapping. Therefore, when the quantum transmission network is not stable, the packet switching transmission protocol has a better transmission performance, and it can be applied to the future construction of quantum network.
With a growing number of quantum networks in operation, there is a pressing need for performance analysis of quantum switching technologies. A quantum switch establishes, distributes, and maintains entanglements across a network. In contrast to a classical switching fabric, a quantum switch is a two-sided queueing network. The switch generates Link-Level Entanglements (LLEs) across links that connect users to the switch, which are then fused to process the network's entanglement requests. First, we characterize the capacity region that is defined as the set of entanglement request rates for which there exists a scheduling policy stabilizing the system. We then show that a sequence of Max-Weight policies that we propose achieve throughput optimality in the asymptotic sense. Our proof techniques analyse a two-time scale separation phenomenon at the fluid scale for a general switch topology. This allows us to demonstrate that the optimal fluid dynamics are given by a scheduling algorithm that solves a certain average reward Markov Decision Process.
With a growing number of quantum networks in operation, there is a pressing need for performance analysis of quantum switching technologies. A quantum switch establishes, distributes, and maintains entanglements across a network. In contrast to a classical switching fabric, a quantum switch is a two-sided queueing network. The switch generates Link-Level Entanglements (LLEs) across links that connect users to the switch, which are then fused to process the network's entanglement requests. First, we characterize the capacity region that is defined as the set of entanglement request rates for which there exists a scheduling policy stabilizing the system. We then show that a sequence of Max-Weight policies that we propose achieve throughput optimality in the asymptotic sense. Our proof techniques analyse a two-time scale separation phenomenon at the fluid scale for a general switch topology. This allows us to demonstrate that the optimal fluid dynamics are given by a scheduling algorithm that solves a certain average reward Markov Decision Process.
This paper puts forward a quantum signaling switch model. The quantum signaling switch consists of a classical information control module, an exchange control module and a quantum exchange module. Classical control module transmits the initial entangled state information to the entanglement measurement and switching unit and updates the routing information. Exchange control module will choose the path, and is ready for the distribution channel of the entanglement photons. The quantum exchange module generates quantum entanglement pairs, measures the Bell state and achieves entanglement swapping. Quantum signaling switches can realize multi-user communication and local area network communication. Through the performance analysis and simulation of the switch, the results show that the switch is simple in structure, secure and easy to expand; also the time delay is small. This will be helpful for the construction of the quantum communication network.