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Chinese Physics Letters

Symmetric Telecloning and Entanglement Distribution of Spin Quantum States

王琼, 李际新, 曾浩生

Published Jan 1, 2008• 0 citations
OpenAlex

Abstract

我们建议为旋转量状态克隆机器的对称的电视的一条物理认识。区域一般水准的概念。delity 被介绍描述克隆质量的电视。为某些输入状态，这数量可以来到足够的高水平满足量信息处理的需要，这被显示。我们也经由旋转链学习纠纷分发的性质因为任意的 two-qubit 作为输入纠缠了纯状态并且发现为输出状态的纠纷的腐烂比率被旋转链和等待的时间的参数仅仅决定，独立于起始的输入状态。

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我们建议为旋转量状态克隆机器的对称的电视的一条物理认识。区域一般水准的概念。delity 被介绍描述克隆质量的电视。为某些输入状态，这数量可以来到足够的高水平满足量信息处理的需要，这被显示。我们也经由旋转链学习纠纷分发的性质因为任意的 two-qubit 作为输入纠缠了纯状态并且发现为输出状态的纠纷的腐烂比率被旋转链和等待的时间的参数仅仅决定，独立于起始的输入状态。
We propose a physical realization of symmetric telecloning machine for spin quantum states. The concept of area average fidelity is introduced to describe the telecloning quality. It is indicated that for certain input states this quantity may come to an enough high level to satisfy the need of quantum information processing. We also study the properties of entanglement distribution via the spin chain for arbitrary two-qubit entangled pure states as inputs and find that the decay ratio of entanglement for the output states is only determined by the parameters of spin chain and waiting time, independent of the initial input states.
在这篇论文，我们基于旋转网络建议长途的量密码学的一个新计划， qubits 在量点的电子旋转存储了。由有条件的法拉第，旋转，单个光子极化测量，和量状态转，为在二个长途的聚会之间的量密码学的最大纠缠贝尔状态被创造。同时，在任意的距离上的有效的量状态转移被联合力量的一种合适的选择在旋转链获得，用旋转记忆，技术改善了。我们也对能也在旋转网络被实现并且发现克隆的这个旋转网络与一致，最佳的忠实为基于纠纷的密码学由一个偷听者完成了的基于克隆的攻击分析计划的安全。
A scheme for implementing 1 → 2 symmetric economical phase-covariant telecloning of a bipartite entangled state is proposed based on a quantum logic network. The quantum circuits for preparing the telecloning channel and for teleporting the input state are presented, respectively. There is no ancilla needed for preparing the channel, and the fidelity of telecloning is enhanced. Due to only single- and two-qubit operations being used in the whole process, it can be easily implemented in experiment.
Telecloning -- the combination of quantum teleportation and cloning -- offers a powerful mechanism to disseminate unknown quantum states to multiple spatially separated recipients with optimal fidelity. Despite its conceptual importance for quantum networks, an experimental demonstration of symmetric qubit quantum telecloning remains elusive, particularly due to the challenges of generating multipartite entangled resource states and implementing stable multi-photon interference across distributed nodes. Here, we realize the optimal 1 to 2 symmetric quantum telecloning using a scalable silicon photonic platform. We implement a six-photon protocol using two independent, fiber-linked photonic chips: one generating a heralded input state and the other preparing a four-photon entangled resource state. By performing an interchip Bell-state measurement, we successfully distribute the input state into two optimal clones at remote nodes. We observe an interchip cloning fidelity of 78.45 ±\pm± 1.39%, exceeding the classical limit of 2/3 by 8 standard deviations. Our results demonstrate the robust generation and manipulation of complex multi-photon states between integrated chips, providing a foundational building block for large-scale multi-party quantum networks.