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IEEE International Conference on Communication Software and Networks

The quantum channel-time division multiplex on entangled state

Xiaohui Liu, Min Nie, Changxing Pei

Published May 1, 2011• 0 citations
Publisher

Abstract

Based on the classical time division multi-channel communication theory, we present the scheme of quantum channel-time division multiplex (QC-TDM). Moreover, the model of quantum time division multiplexer (QTDM) are proposed. The quantum bit error rate (QBER) is analyzed and the QBER simulation test is performed. The scheme shows that the QTDM can carry out multi-user communication through quantum channel, the QBER can also reach the reliability requirement of communication. The scheme of QC-TDM may play an important role in the establishment of quantum communication in large scale in the future.

DOI
10.1109/iccsn.2011.6014616

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Based on the classical time division multi-channel communication theory, we present the scheme of quantum channel-time division multiplex (QC-TDM). Moreover, the model of quantum time division multiplexer (QTDM) are proposed. The quantum bit error rate (QBER) is analyzed and the QBER simulation test is performed. The scheme shows that the QTDM can carry out multi-user communication through quantum channel, the QBER can also reach the reliability requirement of communication. The scheme of QC-TDM may play an important role in the establishment of quantum communication in large scale in the future.
Based on the classical time division multi-channel communication theory, we present a scheme of quantum time-division multi-channel communication (QTDMC). Moreover, the model of quantum time division switch (QTDS) and correlative protocol of QTDMC are proposed. The quantum bit error rate (QBER) is analyzed and the QBER simulation test is performed. The scheme shows that the QTDS can carry out multi-user communication through quantum channel, the QBER can also reach the reliability requirement of communication, and the protocol of QTDMC has high practicability and transplantable. The scheme of QTDS may play an important role in the establishment of quantum communication in a large scale in the future.
Based on the Fock space and quantum transmission line theory, the time division multiplexing (TDM) quantum frame structure is designed. For quantum frame structure, the state transition diagram of quantum frame is given, and the state transfer matrix of quantum frame is presented. The partial trace of the frame is accorded with the completely positive trace-preserving (CPTP) mapping. Based on the quantum time division multiplexing (QTDM) system, the traditional frame and quantum frame can be combined into double-frame structure which mathematical representation is defined, and finally quantum teleportation protocol is operated.
把多信道的通讯理论基于古典时间部门，我们在场量时间部门的一个计划多信道的通讯(QTDMC ) 。而且，量时间部门开关(QTDS ) 的模型和 QTDMC 的关联词协议被建议。量小点错误率(QBER ) 被分析， QBER 模拟测试被执行。计划证明 QTDS 能通过量隧道执行多用户通讯， QBER 能也到达通讯的可靠性要求，并且 QTDMC 的协议有高有实行可能并且可移植。QTDS 的计划以后可以在大规模在量通讯的建立起一个重要作用。[从作者抽象]
By use of simulation, qualitative validation, and mathematical modelling, the paper studies the role of quantum entanglement as a means of secure communication system. To gauge their eavesdropping defence, pairs of entangled photons were modelled according to the density matrix approach, and simulated at different noise intensities and channel lengths. Quantum bit error rate (QBER), mutual information rate plots between legitimate users and eavesdropper, Bell inequality violation as a demonstration of genuine entanglement were some very important indicators of performance. An examination of this showed Monte Carlo simulation indicated that (QBER) was lower than the parameter required to secure an adequate method of distributing keys, and that mutual information favoured a legitimate channel. The results have shown that transmission security can also be achieved in practical settings with the theoretical criterion I(A;B)I(A;B) > I(A;E) being true. The entanglement-based system practical solutions and their viability and socio-ethical implications were emphasized, which added more corroborative evidence through qualitative expert reviews. A critical evaluation was created based on a complex of quantitative and qualitative techniques, and the result has been writing down that quantum entanglement is highly advantageous as compared to classical cryptography practices. The paper also emphasizes entanglement as a key enabler of next-generation communication security, particularly in the wake of threat posed to conventional computing by quantum computing, in spite of the technical challenges of photon loss and decoherence.
Time-sharing of Quantum Key Distribution (QKD) transceivers with the help of optical switches and a central Software-Defined Networking (SDN) controller is a promising technique to better amortize the large investments required to build a Quantum Key Distribution Network (QKDN). In this work, we investigate the implications of introducing Time-Division Multiplexing (TDM) in trusted-relay QKDNs at the wide-area network scale in terms of performance and cost-saving. To this end, we developed both a Mixed Integer Linear Programming (qTDM-MILP) model and a Heuristic Algorithm (qTDM-HA) to solve the allocation of QKD transceivers and network resources for a novel switched QKDN operating scheme: qTDM-QKDN. Our heuristic method provides a close-to-optimal resource planning for the offline problem that computes the minimum number of QKD transceivers and optical switch ports at each node, as well as the number of quantum channels on each link required to satisfy a target set of end-to-end secret-keyrate demands. Moreover, both the model and the heuristic provide the time fractions that each QKD transceiver needs to peer with each neighbor QKD transceiver. We compared our proposed model and heuristic algorithm for cost minimization with non-time sharing QKD transceivers (nTDM) as baseline. The results show that qTDM can achieve substantial cost-savings in the range of 10%–40% compared to nTDM. Furthermore, this work sheds light on the selection of the value for the working cycle T and its influence on network performance. • TDM optimizes QKD networks, enhancing efficiency and cost-effectiveness. • A MILP model and the qTDM-HA ease resource allocation in large-scale QKD networks. • The tools provide outstanding solutions from 10% to 40% in terms of cost-savings. • TDM minimizes the number of dedicated QKD transceivers by using shared ones wisely.