QUANTUM, Johannes Gutenberg-Universität Mainz, Staudinger Weg 7, 55128 Mainz, Germany.
School of Physics and Astronomy, Nottingham NG7 2RD, United Kingdom.
Phys Rev Lett. 2019 Oct 11;123(15):153603. doi: 10.1103/PhysRevLett.123.153603.
We introduce a scheme to entangle Rydberg ions in a linear ion crystal, using the high electric polarizability of the Rydberg electronic states in combination with mutual Coulomb coupling of ions that establishes common modes of motion. After laser initialization of ions to a superposition of ground and Rydberg states, the entanglement operation is driven purely by applying a voltage pulse that shuttles the ion crystal back and forth. This operation can achieve entanglement on a sub-μs timescale, more than 2 orders of magnitude faster than typical gate operations driven by continuous-wave lasers. Our analysis shows that the fidelity achieved with this protocol can exceed 99.9% with experimentally achievable parameters.
我们提出了一种在线性离子晶体中纠缠里德堡离子的方案，利用里德堡电子态的高极化率和离子之间的库仑耦合建立共同的运动模式。在激光将离子初始化到基态和里德堡态的叠加态之后，通过施加一个电压脉冲来实现纠缠操作，该脉冲将离子晶体来回穿梭。这种操作可以在亚微秒的时间尺度上实现纠缠，比由连续波激光驱动的典型门操作快两个数量级以上。我们的分析表明，在实验可实现的参数下，该协议可以实现超过 99.9%的保真度。
