全光纤0型Sagnac源产生的宽带电信波段纠缠
Broadband Telecom Entanglement from an All-Fiber Type-0 Sagnac Source
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中文总结 AI 辅助
该研究展示了一种基于现成组件、全光纤0型Sagnac源的紧凑电信波段偏振纠缠光子对源，实现了高保真度纠缠，并支持多用户纠缠分发。
中文摘要 AI 辅助
我们展示了一种紧凑、实用的全光纤非简并电信波段偏振纠缠光子对源，该源由现成组件组装而成。紧凑的光纤集成架构设计旨在成本低廉、组装和对准简便，并与现有光纤基础设施兼容。光子对通过嵌入Sagnac干涉仪中的尾纤周期性极化铌酸锂波导中的0型自发参量下转换产生。在0.5 mW泵浦功率下，量子态层析成像得到贝尔态保真度$F_{\Phi^-}=0.850$，纯度$P=0.836$，并发度$C=0.782$。另一次CHSH测量给出$S=2.3301\pm0.0075$。测得的贝尔态保真度足以使重构的偏振态在理想协议操作下支持量子比特隐形传态超过经典保真度极限。密度矩阵分析表明，约96.7%的布居保留在所需的$|HH\rangle$-$|VV\rangle$子空间中，归一化相干性约为0.86。残余的相对相位偏移表明，局部相位补偿可将贝尔态保真度提高至约0.8865。我们进一步表征了亮度-质量权衡，并获得了修正后的配对率斜率$(0.918\pm0.040)$ Mcps mW$^{-1}$。宽带发射和光纤接口为通过现成的多通道波分复用器（其通带与信号和闲频波长匹配）实现多用户纠缠分发提供了途径。
英文摘要
We demonstrate a compact, practical all-fiber source of non-degenerate telecom-band polarization-entangled photon pairs assembled from off-the-shelf components. The compact fiber-integrated architecture is designed to be affordable, straightforward to assemble and align, and compatible with existing optical-fiber infrastructure. Photon pairs are generated through type-0 spontaneous parametric down-conversion in a pigtailed periodically poled lithium-niobate waveguide embedded in a Sagnac interferometer. At 0.5 mW pump power, quantum-state tomography yields a Bell-state fidelity $F_{Φ^-}=0.850$, purity $P=0.836$, and concurrence $C=0.782$. A separate CHSH measurement gives $S=2.3301\pm0.0075$. The measured Bell-state fidelity is sufficient for the reconstructed polarization state to support qubit teleportation above the classical fidelity limit under ideal protocol operations. Analysis of the density matrix shows that approximately 96.7% of the population remains in the desired $|HH\rangle$-$|VV\rangle$ subspace, with a normalized coherence of approximately 0.86. A residual relative-phase offset indicates that local phase compensation could increase the Bell-state fidelity to approximately 0.8865. We further characterize the brightness--quality trade-off and obtain a corrected pair-rate slope of $(0.918\pm0.040)$ Mcps mW$^{-1}$. The broadband emission and fiber interfaces offer a route to multiuser entanglement distribution through off-the-shelf multichannel wavelength-division multiplexers with passbands matched to the signal and idler wavelengths.
发表机构
- KTH Royal Institute of Technology（瑞典皇家理工学院）
- Rise Research Institutes of Sweden（瑞斯瑞典研究院）
- Quantum Scopes AB（量子视野有限公司）
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