Universal gates for a metastable qubit in strontium-88
中文速览 本论文提出并实验验证了一种基于玻色子同位素锶-88亚稳态精细结构能级的量子比特方案。研究团队成功演示了一套完整的通用量子门操作，实现了高保真度的单比特门（0.993）和两比特门（0.9945）。该方案的核心优势在于其“擦除转换”能力：利用量子比特编码空间之外的稳定基态，可以将计算过程中发生的泄漏错误转化为可被实时探测到的原子丢失事件（即擦除错误），这极大地简化了量子纠错的难度。此外，研究者还开创了一种新颖的、能够分辨两个量子比特态的探测方案，从而能够精确地识别和处理原子丢失。这些成果确立了锶原子精细结构量子比特作为一种极具潜力的平台，为构建可扩展、抗错误的量子计算机开辟了新的道路。 English Research Briefing Research Briefing: Universal gates for a metastable qubit in strontium-88 1. The Core Contribution This paper establishes the fine-structure states of bosonic strontium-88 as a high-performance qubit platform for fault-tolerant quantum computing. The authors successfully demonstrate a universal gate set, achieving single- and two-qubit gate fidelities exceeding 99.3% and 99.4% respectively. The central advance is the synergistic implementation of this qubit with two critical error-handling techniques: mid-circuit erasure conversion, which transforms dominant leakage errors into detectable atom loss, and a novel state-resolved detection scheme that can precisely identify these loss events. This work collectively demonstrates a viable and scalable architecture that directly addresses the challenges of leakage and loss, two of the most significant obstacles in neutral-atom quantum computing. ...