Chi-Yee Cheung
Using entanglement swapping, we construct a scheme to distribute an arbitrary multiparticle state to remote receivers. Only Bell states and two-qubit collective measurements are required.
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We generalize the procedure of entanglement swapping to obtain a scheme for manipulating entanglement in multiparticle systems. We describe how this scheme allows to establish multiparticle entanglement between particles belonging to distant users in a communication network through a prior distribution of singlets followed by only local measurements. We show that this scheme can be regarded as a method of generating entangled states of many particles and compare it with existing schemes using simple quantum computational networks. We highlight the practical advantages of using a series of enta…
We show how branching spin chains can be used to both generate and distribute entanglement from their natural dynamics. Such entanglement provides a useful resource, for example for teleportation or distributed quantum processing. Once distributed, this resource can be isolated through mapping or swapping the entanglement into specific qubits at the ends of branches. Alternatively, as we demonstrate for distributed bipartite entanglement, applying simple single-qubit operations to the end spin of one or more branches can dynamically freeze the entanglement at the branch ends.
We address the problem of relative frequencies of singlet and triplet recombinations in a multiparticle system, which consists of spin-correlated radical ion pairs. The nonlocal swapping of spin correlations due to cross-recombinations is taken into account. It is shown that this swapping does not contribute to singlet and triplet recombination frequencies in the absence of spin evolution in the correlated pairs.
Doubly-parametric quantum transducers (DPTs), such as electro-opto-mechanical devices, show promise as quantum interconnects between the optical and microwave domains, thereby enabling long distance quantum networks between superconducting qubit systems. However, any transducer will inevitably introduce loss and noise that will degrade the performance of a quantum network. We explore how DPTs can be used to construct a network capable of distributing remote two-mode microwave entanglement over an optical link by comparing fourteen different network topologies. The fourteen topologies we analyz…
Entanglement Swapping Scheduling for Quantum Repeater Chains under Decoherence during Classical Communications
本研究开发分析模型，揭示量子中继链中中继器数量增加与退相干影响间的权衡，发现存在最优中继器数量，为未来量子网络设计提供指导。
Entanglement Swapping in Quantum Switches: Protocol Design and Stability Analysis
本文研究了量子交换机中纠缠交换的协议设计与稳定性分析，提出了能稳定量子交换机并使未完成纠缠请求数量以高概率有界的调度协议，其中按需协议经量子网络离散事件模拟器验证具备高计算效率、高保真度与低延迟。
We propose the use of hybrid entanglement in an entanglement swapping protocol, as means of distributing a Bell state with high fidelity to two parties, Alice and Bob. The hybrid entanglement used in this work is described as a discrete variable (Fock state) and a continuous variable (cat state superposition) entangled state. We model equal and unequal levels of photonic loss between the two propagating continuous variable modes, before detecting these states via a projective vacuum-one-photon measurement, and the other mode via balanced homodyne detection. We investigate homodyne measurement …
Entanglement-swapping measurements for deterministic entanglement distribution
本研究提出了一种无后选择的确定性纠缠交换方案，利用复Hadamard矩阵构建最优测量，实现量子网络中高效纠缠分发。
Entanglement distribution in quantum networks via swapping of partially entangled pure states
研究通过交换协议在不同拓扑结构的量子网络中分发纠缠，探讨初始部分纠缠纯态在协议下的纠缠演变及生成最大纠缠态的成功概率。
Distribution of the entangled state of trapped atomic ions to long distance using quantum repeater protocol is considered. Indeed, the long distance is divided into short parts, and then using entanglement generation and entanglement swapping techniques in optomechanical cavities, the entanglement is distributed. To do the task, we perform interaction between trapped atomic ions in optomechanical cavities, operate proper measurements on trapped ions and also make Bell state measurement as a well-known way to swap the entanglement. Accordingly, the entanglement is distributed between target ion…
A nonconvex entanglement monotone determining the characteristic length of entanglement distribution in continuous-variable quantum networks
本文提出一类连续变量纠缠度量，并确定非凸纠缠单调量“比率负性”，用以刻画纯高斯态链上最优纠缠交换的指数衰减，为统计物理方法分析CV量子网络提供新途径。
A Brief Introduction to Quantum Network Control
本文简要介绍了量子网络控制领域，阐述了量子比特与纠缠如何支撑纠缠交换等操作，提出了多跳量子网络中的纠缠分发模型，并指出了量子网络容量区域表征与吞吐量最优策略设计等开放研究问题。
Complete analysis of a realistic fiber-based quantum repeater scheme
提出一种基于时间复用的量子中继器协议，通过专用通信阶段提高试验速率，结合纠缠交换与纯化，在1000公里距离上实现1至1000 Hz的密钥速率，并指出需约一秒的存储相干时间和10^{-3}量级的门及测量错误。
Deterministic Entanglement Distribution on Series-Parallel Quantum Networks
本文提出基于并发度渗流理论的确定性纠缠传输方案，用串并联规则刻画纠缠交换与浓缩，在任意拓扑和 qudit 上建立最优性框架，并经 IBM 平台验证优于 CEP 与嵌套中继器。
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