论文标题
波长不敏感的多物种纠缠栅极的原子离子纠缠闸门
A Wavelength-Insensitive, Multispecies Entangling Gate for Group-2 Atomic Ions
论文作者
论文摘要
我们提出了一种光学方案，用于在共同捕获相同或不同的碱性地球原子离子（$^{40} \ text {ca}^+$，$^{88} \ text {sr}^+$，$^+$，$^{138} {138} \ text {展示基本错误率低于$ 10^{ - 4} $，并且可以通过从紫外线到红外的各种激光波长实现。我们还讨论了此技术的直接扩展，其中包括两个最轻的组2离子（$ \ text {be}^+$，$ \ text {mg}^+$）in multispecies纠缠。这种不敏感的几何相位门的关键要素是使用地面（$ s_ {1/2} $）和一个稳态（$ d_ {5/2} $）电子状态作为$σ^zσ^zσ^z $ sightangift Gate。我们介绍了该门方案的原理和基本误差源的详细分析，其中包括光子散射和自发发射反应性，计算在光谱的很大一部分（300 nm至2 $μ\文本{m} $）上，计算固定激光束强度的两个Qubit-Gate错误率和持续时间。我们将该技术的优点和缺点与以前的被困离子纠缠的门进行了对比，并讨论了其在量子信息处理和模拟中的应用，并使用类似和多种物种离子晶体。
We propose an optical scheme for generating entanglement between co-trapped identical or dissimilar alkaline earth atomic ions ($^{40}\text{Ca}^+$, $^{88}\text{Sr}^+$, $^{138}\text{Ba}^+$, $^{226}\text{Ra}^+$) which exhibits fundamental error rates below $10^{-4}$ and can be implemented with a broad range of laser wavelengths spanning from ultraviolet to infrared. We also discuss straightforward extensions of this technique to include the two lightest Group-2 ions ($\text{Be}^+$, $\text{Mg}^+$) for multispecies entanglement. The key elements of this wavelength-insensitive geometric phase gate are the use of a ground ($S_{1/2}$) and a metastable ($D_{5/2}$) electronic state as the qubit levels within a $σ^z σ^z$ light-shift entangling gate. We present a detailed analysis of the principles and fundamental error sources for this gate scheme which includes photon scattering and spontaneous emission decoherence, calculating two-qubit-gate error rates and durations at fixed laser beam intensity over a large portion of the optical spectrum (300 nm to 2 $μ\text{m}$) for an assortment of ion pairs. We contrast the advantages and disadvantages of this technique against previous trapped-ion entangling gates and discuss its applications to quantum information processing and simulation with like and multispecies ion crystals.
