Cloning scheme for multipartite entangled pure states via photonic quantum walk  

基于光量子行走的多体量子纠缠纯态克隆方案

作　　者：WANG Guocui LIN Zhi LI Xikun YANG Qing YANG Ming 王国翠;林志;李曦坤;杨青;杨名(安徽大学物理与光电工程学院,安徽合肥230601)

机构地区：[1]School of Physics and Optoelectronic Engineering,Anhui University,Hefei 230601,China

出　　处：《量子电子学报》2025年第2期206-216,共11页Chinese Journal of Quantum Electronics

基　　金：国家自然科学基金项目(11947102,12004005);安徽省自然科学基金项目(2008085MA16,2008085QA26);安徽省高校协同创新项目(GXXT-2022-039);安徽省高校杰出青年基金项目(2022AH020008)。

摘　　要：The no-cloning theorem has sparked considerable interest in achieving high-fidelity approximate quantum cloning.Most of the previous studies mainly focused on the cloning of single particle states,and cloning schemes used there are incapable of cloning quantum entangled states in multipartite systems.Few schemes were proposed for cloning multiparticle states,which consume more entanglement resources with loss of qubits,and the fidelity of the cloned state is relatively low.In this paper,cloning schemes for bipartite and tripartite entangled states based on photonic quantum walk and entanglement swapping are proposed.The results show that according to the proposed schemes,two high-fidelity(up to 0.75)cloned states can be obtained with less quantum resource consumption.Because of the simple cloning steps,few quantum resources and high fidelity,these schemes are both efficient and feasible.Moreover,this cloning machine eliminates the need for tracing out cloning machine,thereby minimizing resource waste.量子不可克隆定理使得高保真度的近似量子态克隆成为研究热点。现有的工作主要聚焦于单粒子态克隆,但无法直接应用于多粒子纠缠态。本文提出基于光量子行走与纠缠交换的两体及三体纠缠态克隆方案。结果表明,该方案能以较少的量子资源消耗获得两个高保真度克隆态(最高可达0.75)。该方案在克隆过程中无需牺牲额外光子,显著降低了资源浪费。由于实验步骤简捷且兼容现有技术,本方案具备较高可行性。

关 键 词：quantum optics entanglement cloning photonic quantum walk multipartite entanglement 

分 类 号：O431.2[机械工程—光学工程]