从单个固态中分辨不清的电信频段光子
在PubMed上查看摘要
概括
此摘要是机器生成的。研究人员减少了量子重复子的稀土离子的光谱扩散. 这一突破使CaWO4晶体中的离子能够实现更强大的量子通信网络.
科学领域
- 量子通信
- 固态物理
- 量子信息科学
背景情况
- 原子缺陷对于量子重复器网络来说至关重要.
- 稀土离子,特别是Er3+,由于它们的光学转换,对电信带量子通信具有前景.
- 光谱扩散阻碍了无法区分的单光子生成,限制了重复节点的发展.
研究的目的
- 在量子重复器应用中显著减少稀土离子的光谱扩散.
- 为了实现长距离量子通信的单光子生成.
主要方法
- 在CaWO4晶体中植入Er3+离子,选择非极点对称性,低核自旋脱凝度和缺乏背景稀土离子.
- 将浅层植入的离子合到具有高普塞尔因子的纳米光子腔.
- 光线宽度,长期光谱扩散和旋转放松时间的表征.
主要成果
- 在单扫描光线宽度为150kHz和长期扩散为63kHz的情况下,显著减少光谱扩散.
- 在36公里延迟后,观察到连续发射的光子之间的Hong-Ou-Mandel干扰可见度为80%.
- 测量长的旋转放松时间 (T1,s = 3.7 s,T2,s > 200 μs),T2,s受到杂质而不是核旋转的限制.
结论
- 开发的Er3+化CaWO4系统显示光谱扩散大大减少,克服了量子重复器的一个关键限制.
- 观察到的不可区分的光子生成和长的自旋相干时间代表了实际电信频段量子重复器网络的重大进展.
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