论文标题
快速纠缠长离子链中的大门
Fast entangling gates in long ion chains
论文作者
论文摘要
我们提出了一个模型，用于在任意长的离子链中实现具有超快速脉冲的快速纠缠门（$ {\ sim} 1〜μ $ s），这需要较少的液体脉冲，并且可以在实验能力中以激光重复速率实现。我们证明，我们能够优化在任意长的离子链中具有理论上保真度以上$ 99.99 \％$的脉冲序列，以$ 100-300 $ 〜mhz的订单为单位，以激光重复率。值得注意的是，我们发现较长离子链中的门不需要更高的重复率，这与其他栅极方案的缩放分析相反。当我们的计算中考虑脉冲缺陷时，我们发现可实现的门保真度独立于链中的离子数量。我们还表明，脉冲控制要求不会随离子数量扩展。我们发现，从单个超快速脉冲中的人口转移效率高于$ 99.9 \％$，是实现高保真大门的门槛，这在近未实现的实验中可能是可以实现的。
We present a model for implementing fast entangling gates (${\sim}1~μ$s) with ultra-fast pulses in arbitrarily long ion chains, that requires low numbers of pulses and can be implemented with laser repetition rates well within experimental capability. We demonstrate that we are able to optimise pulse sequences that have theoretical fidelities above $99.99\%$ in arbitrarily long ion-chains, for laser repetition rates on the order of $100-300$~MHz. Notably, we find higher repetition rates are not required for gates in longer ion chains, which is in contrast to scaling analyses with other gate schemes. When pulse imperfections are considered in our calculations, we find that achievable gate fidelity is independent of the number of ions in the chain. We also show that pulse control requirements do not scale up with the number of ions. We find that population transfer efficiencies of above $99.9\%$ from individual ultra-fast pulses is the threshold for realising high-fidelity gates, which may be achievable in near-future experiments.
