论文标题
在电信波长处的光子Qubits的按需存储
On-demand storage of photonic qubits at telecom wavelengths
论文作者
论文摘要
电信波长的量子记忆对于基于现有的纤维网络的大规模量子网络的构建至关重要。电信光子量动机的按需存储是对此类网络应用程序的基本要求，但尚待证明。在这里，我们使用$^{167} $ er $^{3+} $：y $ _2 $ _2 $ sio $ _5 $ Crystal的激光器写入的波导，证明了电信光子盘的存储和按需检索。波导内存的两端与纤维纤维效率为51％的纤维阵列直接连接。对于用单光子级相干脉冲编码的时量量子量，可以获得98.3（1）％的存储保真度，这远远超出了可以通过经典措施和准备策略来实现的最大忠诚度。该设备具有高可靠性，易于可扩展性，并且可以直接集成到光纤网络中，这可能在基于光纤的量子网络中起着至关重要的作用。
Quantum memories at telecom wavelengths are crucial for the construction of large-scale quantum networks based on existing fiber networks. On-demand storage of telecom photonic qubits is a fundamental request for such networking applications but yet to be demonstrated. Here we demonstrate the storage and on-demand retrieval of telecom photonic qubits using a laser-written waveguide fabricated in an $^{167}$Er$^{3+}$:Y$_2$SiO$_5$ crystal. Both ends of the waveguide memory are directly connected with fiber arrays with a fiber-to-fiber efficiency of 51%. Storage fidelity of 98.3(1)% can be obtained for time-bin qubits encoded with single-photon-level coherent pulses, which is far beyond the maximal fidelity that can be achieved with a classical measure and prepare strategy. This device features high reliability, easy scalability and can be directly integrated into fiber networks, which could play an essential role in fiber-based quantum networks.
