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干涉计集成噪声免疫量子记忆
Zhifei Yu1, Zeliang Wu1, Xuejie Li1
1State Key Laboratory of Precision Spectroscopy, School of Physics and Electronic Science, East China Normal University, Shanghai 200062, China.
Physical review letters
|October 28, 2023
概括
这项研究引入了一种新型的量子内存,该内存集成了光子相关的量子干扰计,以消除过剩的噪音. 这项创新提高了内存效率,抑制了噪音,为实际的量子信息技术铺平了道路.
科学领域:
- 量子信息科学 量子信息科学
- 量子光学是一种量子光学.
- 原子物理 原子物理
背景情况:
- 实际的量子信息技术需要具有低噪声,高效率和高带宽的量子内存.
- 在量子信息处理过程中的过度噪声会降低量子状态.
- 当前的量子内存技术在同时实现高性能指标方面面临着挑战.
研究的目的:
- 开发一个具有内置过度噪声除能力的量子内存.
- 为了提高量子内存的效率,并抑制噪声到真空水平.
- 为了证明这种新型量子记忆在卢比蒸汽电池中的性能.
主要方法:
- 在量子记忆系统中整合光子相关的量子干涉计.
- 使用破坏性干扰来抑制过量的噪音.
- 使用鲁比蒸汽电池和长10纳秒的光子信号进行演示.
主要成果:
- 观察到大约80%的噪声抑制.
- 通过干扰测量,写入效率从87%提高到96.2%.
- 实现的记忆效率 (不包括噪声) 从70%提高到77%.
- 在单光子水平上表现出高保真度 (93.7%),超过了不克隆的极限.
结论:
- 开发的量子内存有效地抑制了过量的噪音,提高了效率.
- 这种干涉测量集成的量子内存代表了量子信息处理的重大进步.
- 该技术同时实现低噪音,高带宽,高效率和易于操作.
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