论文标题
片上波导中光子Qubit的点播量子存储
On-demand quantum storage of photonic qubits in an on-chip waveguide
论文作者
论文摘要
光子量子存储器是量子信息处理（QIP）中的核心元素。对于可扩展且方便的实用应用，基于固体中制造的各种波导的综合量子记忆，已付出了巨大的努力。但是，QIP的基本要求的按需存储是使用这种集成量子存储器实现的挑战。在这里，我们报告了$^{151} $ eu $^{3+} $：y $ _2 $ _2 $ sio $ _5 $ crystal，使用Stark stark调制的原子频率梳子协议。量子存储保真度为$ 99.3 \％\ pm0.2 \％$，每脉冲的输入为0.5个光子，远远超出了使用经典的措施和预备策略可实现的最高保真度。带有按需检索能力的开发的集成量子存储器代表了朝着量子网络中集成量子节点实际应用的重要步骤。
Photonic quantum memory is the core element in quantum information processing (QIP). For the scalable and convenient practical applications, great efforts have been devoted to the integrated quantum memory based on various waveguides fabricated in solids. However, on-demand storage of qubits, which is an essential requirement for QIP, is still challenging to be implemented using such integrated quantum memory. Here we report the on-demand storage of time-bin qubits in an on-chip waveguide memory on the surface of a $^{151}$Eu$^{3+}$:Y$_2$SiO$_5$ crystal, utilizing the Stark modulated atomic frequency comb protocol. A qubit storage fidelity of $99.3\%\pm0.2\%$ is obtained with a input of 0.5 photons per pulse, far beyond the highest fidelity achievable using the classical measure-and-prepare strategy. The developed integrated quantum memory with the on-demand retrieval capability, represents an important step towards practical applications of integrated quantum nodes in quantum networks.
