AI 中文总结
研究通过偏振到时间-比特转换实现离子-光子纠缠，利用偏振分辨非对称马赫-曾德尔干涉仪，将偏振编码光子转换到时间-比特基，通过\(^{88}\)Sr\(^{+}\)离子跃迁产生光子量子比特，测量得到高保真度且不受去极化噪声影响。
AI 中文摘要
时间-比特光子量子比特因其对光纤链路中偏振不稳定性的鲁棒性以及在异构网络中的潜力，非常适合量子网络应用。在这项工作中，我们首次实现了处于纠缠态的光子量子比特与物质量子比特之间的保纠缠偏振到时间-比特转换。最初通过偏振编码产生的光子通过偏振分辨非对称马赫-曾德尔干涉仪转换到时间-比特基。光子量子比特通过\(^{88}\)Sr\(^{+}\)离子的\(1092\)nm跃迁产生。我们测量了状态保真度界限为\(0.906 \pm 0.011 \le \mathcal{F} \le 0.934\pm 0.011\)，转换误差\(< 0.028\)，并发现即使在完全去极化强度下，这种保真度也不受去极化噪声影响。
英文摘要
Time-bin photonic qubits are well-suited for quantum network applications due to their robustness to polarization instability in fiber links and potential for heterogeneous networks. In this work, we implement the first entanglement-preserving polarization-to-time-bin conversion of a photon qubit in an entangled state with a matter qubit, together with the independent work of Haen \textit{et al.} \cite{haen2026telecom}. Photons initially generated with polarization encoding are converted to the time-bin basis through a polarization-discriminating asymmetric Mach--Zehnder interferometer. The photonic qubits are generated via the $1092$~nm transition of a $^{88}$Sr$^{+}$ ion. We measure state fidelity bounds of $0.906 \pm 0.011 \le \mathcal{F} \le 0.934\pm 0.011$, with conversion error $< 0.028$, and find this fidelity shows no statistically significant reduction under depolarizing noise, even at full depolarization strength.
