AI 中文总结
该研究演示了一种可将原子波长偏振编码的原子-光子纠缠转换为电信C波段时间-bin编码的接口，其保真度达96.3(4.2)%，为异构量子网络提供关键构建模块。
AI 中文摘要
未来量子网络的一个关键支撑特性是不同波长运行、采用不同量子比特编码的平台之间的互操作性。我们演示了一种接口，可将原子波长下偏振编码的原子-光子纠缠转换为电信C波段的时间-bin编码。从单个⁴⁰Ca⁺离子生成854 nm的原子纠缠光子，经量子频率转换至1550 nm后，使用基于光纤的类马赫-曾德尔编码器将光子偏振量子比特转换为时间-bin量子比特。对最终态进行的完整量子层析证实，该过程以96.3(4.2)%的保真度保留了纠缠。结合Ferrari等人[arXiv:2607.07805 (2026)]的独立工作，这是首次演示与单个原子量子存储器纠缠的光子的偏振-时间-bin转换。该电信兼容接口支持量子比特在光纤上的稳健传输，为异构量子网络架构提供了关键构建模块。
英文摘要
A key enabling feature of future quantum networks is interoperability between platforms that operate at different wavelengths and with different qubit encodings. We demonstrate an interface that converts atom-photon entanglement from polarization encoding at an atomic wavelength to time-bin encoding in the telecom C-band. Atom-entangled photons at 854 nm are generated from a single $^{40}$Ca$^+$ ion. After quantum frequency conversion to 1550 nm, the photonic polarization qubit is converted into a time-bin qubit using a fiber-based Mach--Zehnder-like encoder. Full quantum tomography of the final state verifies that the process preserves entanglement with 96.3(4.2)% fidelity. Together with the independent work of Ferrari et al. [arXiv:2607.07805 (2026)], this is the first demonstration of polarization-to-time-bin conversion of photons entangled with a single atomic quantum memory. The telecom-compatible interface enables robust qubit transmission over optical fibers and provides a key building block for heterogeneous quantum networking architectures.
Comments10 pages, 6 figures
