Abstract

Quantum information processing based on magnetic ions has potential for applications as the ions can be modified in their electronic properties and assembled by a variety of chemical methods. For these systems to achieve individual spin addressability and high energy efficiency, we exploited the electric field as a tool to manipulate the quantum behaviours of the rare-earth ion which has strong spin-orbit coupling. A Ce:YAG single crystal was employed with considerations to the dynamics and the symmetry requirements. The Stark effect of the Ce³⁺ ion was observed and measured. When demonstrated as a quantum phase gate, the electric field manipulation exhibited high efficiency which allowed up to 57 π/2 operations before decoherence with optimized field direction. It was also utilized to carry out quantum bang-bang control, as a method of dynamic decoupling, and the refined Deutsch-Jozsa algorithm. Our experiments highlighted rare-earth ions as potentially applicable qubits because they offer enhanced spin-electric coupling which enables high-efficiency quantum manipulation.

中文翻译：

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强自旋轨道耦合增强电场操纵：促进稀土离子作为量子位

摘要

基于磁性离子的量子信息处理具有应用潜力，因为离子可以改变其电子特性并通过各种化学方法组装。为了使这些系统实现个体自旋寻址和高能量效率，我们利用电场作为一种工具来操纵具有强自旋轨道耦合的稀土离子的量子行为。考虑到动力学和对称性要求，采用 Ce:YAG 单晶。Ce ³⁺的斯塔克效应离子被观察和测量。当被证明为量子相位门时，电场操纵表现出高效率，在具有优化场方向的退相干之前允许高达 57 π/2 操作。它还被用于执行量子爆炸控制，作为一种动态解耦方法，以及改进的 Deutsch-Jozsa 算法。我们的实验强调了稀土离子作为潜在适用的量子位，因为它们提供了增强的自旋电耦合，可以实现高效的量子操作。