混合量子逻辑和使用两个不同的原子同位素测试贝尔不等式
C J Ballance1, V M Schäfer1, J P Home1
1Department of Physics, University of Oxford, Clarendon Laboratory, Parks Road, Oxford OX1 3PU, UK.
Nature
|December 18, 2015
概括
研究人员使用两种不同的离子同位素创造了混合纠状态. 这一量子信息处理的突破违反了贝尔
科学领域:
- 量子力学
- 量子信息处理
- 原子物理
背景情况:
- 纠是量子信息处理 (QIP) 中至关重要的基本量子性质.
- 之前的实验使用相同的粒子或预告方法产生了纠状态.
- 混合纠与不相同的粒子仍然是一个重大挑战.
研究的目的:
- 确定性地生成和描述两个具有不同同位素的被困离子量子位的混合纠状态.
- 在这个新的纠状态上进行贝尔不等式测试.
- 展示混合物种量子逻辑在量子计算中的潜力.
主要方法:
- 使用一个决定性的,激光驱动的两位量子逻辑门.
- 使用两种不同的同位素 (40) Ca ((+) 和 (43) Ca ((+) 的被困离子.
- 进行了全量子态断层扫描并测试了克劳塞-霍恩-西蒙尼-霍尔特 (CHSH) 贝尔不等式.
主要成果:
- 实现了 (40) Ca(+) 和 (43) Ca(+) 量子位的最大纠状态,准确度为99.8%.
- 违反了CHSH贝尔不等式的15个标准偏差, 关闭了检测漏洞.
- 在被困离子中证明混合物种量子逻辑的可行性.
结论:
- 混合物种量子逻辑是构建被困离子量子计算机的强大技术.
- 开发的纠门机制可以应用于不同的原子元素,减少错误.
- 这种方法对于实现容错量子错误校正和通用量子计算至关重要.
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