论文标题
Time-Bin Qubit在大都市纤维网络上传输的高质量量子过程断层扫描及其应用
High-quality quantum process tomography of time-bin qubit's transmission over a metropolitan fiber network and its application
论文作者
论文摘要
我们采用量子状态和过程层析成像，并使用时芯量子器来对城市范围的大都市量子通信系统进行基准测试。在此网络上，我们实施了实时反馈控制系统来稳定时间键量子位的阶段，并获得99.3％的量子过程保真度，以表明整个量子通信系统的高质量。这使我们能够使用连贯的单向方案实施高性能量子密钥分布的现场试验，其平均量子位错误率和61公里内12小时内的可见性为0.25％和99.2％。我们的结果为带有大都市纤维的高性能量子网络铺平了道路。
We employ quantum state and process tomography with time-bin qubits to benchmark a city-wide metropolitan quantum communication system. Over this network, we implement real-time feedback control systems for stabilizing the phase of the time-bin qubits, and obtain a 99.3% quantum process fidelity to the ideal channel, indicating the high quality of the whole quantum communication system. This allows us to implement field trial of high performance quantum key distribution using coherent one way protocol with average quantum bit error rate and visibility of 0.25% and 99.2% during 12 hours over 61 km. Our results pave the way for the high-performance quantum network with metropolitan fibers.
