双色量子态弱相干极化态的城域光纤量子 teleportation
Bichromatic Quantum Teleportation of Weak Coherent Polarization States on a Metropolitan Fiber
AI总结：
利用城域光纤实现弱相干极化态的量子 teleportation，展示其在真实环境下的高保真度传输及与现有电信基础设施的兼容性。
摘要：
随着量子技术的成熟，电信运营商有机会通过提供连接量子计算机、传感器、钟和其他量子设备的连接层来解锁和扩展新的服务。实现这一机会需要在现有电信基础设施上展示量子网络协议，包括量子 teleportation。在本工作中，我们利用德国电信柏林城域光纤测试平台，使用部署在电信数据中心的商用组件，演示了量子 teleportation。在795 nm光子与双色热原子纠缠光子源之间的本地贝尔态测量，使条件态转移到O波段光子，该光子通过30公里的现场部署光纤环在真实环境条件下传输。通过状态重构，实现了90%的平均teleportation保真度。系统性能在无和有同纤共传C波段经典交通的情况下进行了评估，证明了与承载实时数据通道的波分复用电信基础设施的兼容性。
英文摘要：
As quantum technologies mature, telecommunication operators have a clear opportunity to unlock and scale new services by providing the connectivity layer that links quantum computers, sensors, clocks, and other quantum devices. Realizing this opportunity requires demonstrating quantum networking protocols, including quantum teleportation, under real-world conditions on existing telecom infrastructure. In this work, we demonstrate quantum teleportation over Deutsche Telekom's metropolitan fiber testbed in Berlin using commercial components deployed at the telecom datacenter. A local Bell-state measurement between 795 nm photons from a weak coherent source and from a bichromatic warm-atom entangled photon source enables conditional state transfer onto an O-band photon, which is transmitted through a 30-km field-deployed fiber loop under real-world environmental conditions. The teleported state is reconstructed after propagation via state tomography, achieving an average teleportation fidelity of 90\% on the deployed link. System performance is evaluated in both the absence and the presence of co-propagating C-band classical traffic within the same fiber, demonstrating compatibility with wavelength-division multiplexed telecom infrastructure carrying live data channels.
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