论文标题
纠缠被困的离子量子比230米的纠缠
Entanglement of trapped-ion qubits separated by 230 meters
论文作者
论文摘要
我们在两个原子离子的基本量子网络上报告，分别为230 m。离子被困在不同的建筑物中，并与520（2）m的光纤连接。在每个网络节点上，一个离子的电子状态与单个空腔光子的极化状态纠缠在一起。在光弹器上的光子干扰之后，光子检测带有两个离子之间的纠缠。相对于最大纠缠的钟状状态，达到了高达$（88.2+2.3-6.0）\％$的保真度，成功概率为$ 4 \ times 10^{ - 5} $。我们分析了改进这些指标的路线，为纠缠量子处理器的长距离网络铺平了道路。
We report on an elementary quantum network of two atomic ions separated by 230 m. The ions are trapped in different buildings and connected with 520(2) m of optical fiber. At each network node, the electronic state of an ion is entangled with the polarization state of a single cavity photon; subsequent to interference of the photons at a beamsplitter, photon detection heralds entanglement between the two ions. Fidelities of up to $(88.2+2.3-6.0)\%$ are achieved with respect to a maximally entangled Bell state, with a success probability of $4 \times 10^{-5}$. We analyze the routes to improve these metrics, paving the way for long-distance networks of entangled quantum processors.
