论文标题
量子网络的皮秒同步系统
Picosecond synchronization system for quantum networks
论文作者
论文摘要
长距离量子网络的运行需要同步光子，并且必须考虑量子通道的长度变化。我们展示了200 MHz时钟速率光纤基于光学的量子网络，使用定型的组件与定制的电子设备和电信C波段光子相结合。该网络由具有PS级计时分辨率的可扩展且完全自动化的同步系统支持。光子的同步是通过在网络节点之间分布O波段激光脉冲来实现的。具体而言，我们在三个节点之间分配光子对，并在启用同步系统时，将重合与事故比率的降低从77降低到仅42，这允许高保真零件传输。我们的演示阐明了噪声在量子通信中的作用，并代表了实现已部署的共存经典量子网络的关键步骤。
The operation of long-distance quantum networks requires photons to be synchronized and must account for length variations of quantum channels. We demonstrate a 200 MHz clock-rate fiber optic-based quantum network using off-the-shelf components combined with custom-made electronics and telecommunication C-band photons. The network is backed by a scalable and fully automated synchronization system with ps-scale timing resolution. Synchronization of the photons is achieved by distributing O-band-wavelength laser pulses between network nodes. Specifically, we distribute photon pairs between three nodes, and measure a reduction of coincidence-to-accidental ratio from 77 to only 42 when the synchronization system is enabled, which permits high-fidelity qubit transmission. Our demonstration sheds light on the role of noise in quantum communication and represents a key step in realizing deployed co-existing classical-quantum networks.
