论文标题
与单个$^{167} $ er离子的长距离量子通信的协议
Protocols for long-distance quantum communication with single $^{167}$Er ions
论文作者
论文摘要
我们使用单个$^{167} $ erions设计量子架构，被掺入y $ _2 $ sio $ _5 $ Crystal。该离子是中继器方案的有前途的候选者，因为它的超精细相干时间除了它在电信波长范围内发射光子的能力外。为了在很长的距离内分布纠缠，我们建议使用虚拟腔光子和电偶极 - 偶极相互作用的交换在附近离子之间进行两个不同的交换门。我们分析他们的预期表现，并讨论他们的优势和劣势。然后，我们表明可以通过监测腔发射来实施一种选择后方法来提高虚拟光子交换方案的门效率。最后，我们将结果用于交换门来估计协议的端到端忠诚度和分配率。
We design a quantum repeater architecture using individual $^{167}$Er ions doped into Y$_2$SiO$_5$ crystal. This ion is a promising candidate for a repeater protocol because of its long hyperfine coherence time in addition to its ability to emit photons within the telecommunication wavelength range. To distribute entanglement over a long distance, we propose two different swapping gates between nearby ions using the exchange of virtual cavity photons and the electric dipole-dipole interaction. We analyze their expected performance, and discuss their strengths and weaknesses. Then, we show that a post-selection approach can be implemented to improve the gate fidelity of the virtual photon exchange scheme by monitoring cavity emission. Finally, we use our results for the swapping gates to estimate the end-to-end fidelity and distribution rate for the protocol.
