We report on a quantum interface linking a diamond NV center quantum network node and 795nm photonic time-bin qubits compatible with Thulium and Rubidium quantum memories. The interface makes use of two-stage low-noise quantum frequency conversion and waveform shaping to match temporal and spectral photon profiles. Two-photon quantum interference shows high indistinguishability between converted 795nm photons and the native NV center photons. We use the interface to demonstrate quantum teleportation including real-time feedforward from an unbiased set of 795nm photonic qubit input states to the NV center spin qubit, achieving a teleportation fidelity well above the classical bound. This proof-of-concept experiment shows the feasibility of interconnecting different quantum network hardware.

我们报道了将金刚石 NV 中心量子网络节点与兼容铥和铷量子存储器的 795nm 光子时间仓量子比特连接起来的量子接口。该接口利用两级低噪声量子频率转换和波形整形来匹配时间和光谱光子分布。双光子量子干涉在转换后的 795nm 光子和天然 NV 中心光子之间显示出高度的不可区分性。我们使用该接口来演示量子隐形传态，包括从一组无偏的 795nm 光子量子比特输入态到 NV 中心自旋量子比特的实时前馈，实现了远高于经典边界的隐形传态保真度。这个概念验证实验显示了互连不同量子网络硬件的可行性。