在约瑟夫森相位量子比特中违反贝尔不等式
Markus Ansmann1, H Wang, Radoslaw C Bialczak
1Department of Physics, University of California, Santa Barbara, California 93106, USA.
Nature
|September 26, 2009
概括
研究人员使用约瑟夫森相位量子比特违反了贝尔不等式,证实了固态系统中的量子力学. 这项实验提供了强有力的证据,证明宏观电路的行为是量子系统.
科学领域:
- 量子力学就是量子力学.
- 固态物理 固态物理
- 量子信息科学 量子信息科学
背景情况:
- 量子力学的测量是不可预测的,导致隐藏的经典过程理论.
- 贝尔不等式量化相关性,区分经典和量子行为.
- 以前的实验已经为量子力学提供了证据,但漏洞仍然存在.
研究的目的:
- 为了证明在固态系统中违反贝尔不等式.
- 为宏观电路的量子性质提供实验证据.
- 关闭贝尔不等式测试中的检测漏洞.
主要方法:
- 利用一对约瑟夫森相位量子位作为纠的旋转-1/2粒子.
- 采用了贝尔不等式的克劳泽-霍恩-西蒙尼-霍尔特 (CHSH) 版本.
- 确定性地生成纠状态,并对两个量子位进行一次性测量.
主要成果:
- 证明了违反了CHSH贝尔不平等的情况.
- 测量了2.073 ± 0.0003的贝尔信号,明显超过了2.0的经典极限.
- 结果超过了244个标准偏差的经典界限,关闭了检测漏洞.
结论:
- 该实验提供了强有力的证据,证明宏观电路服从量子力学.
- 证实了在固态系统中观察到的相关性的非经典性质.
- 强化量子力学的完整性作为物理现实的描述.
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