微机械运动的侧带冷却到量子基本状态
J D Teufel1, T Donner, Dale Li
1National Institute of Standards and Technology, Boulder, Colorado 80305, USA. john.teufel@nist.gov
Nature
|July 8, 2011
概括
研究人员使用电机相互作用实现了微机械振荡器的地面状态冷却. 这种量子基本状态的准备和强的合为量子信息传输和测试量子力学铺平了道路.
科学领域:
- 量子物理学的量子物理学
- 机械工程 机械工程
- 应用物理学的应用物理学
背景情况:
- 激光冷却彻底改变了原子系统,实现了量子计算和物质的新状态.
- 洞内光机械/电机械系统使用侧带冷却,但由于环境合,达到量子状态 (少于一量子运动) 是具有挑战性的.
- 以前的方法很难克服宏观物体的热噪声.
研究的目的:
- 为了证明微机械振荡器的侧带冷却到其量子基本状态.
- 为了在宏观的机械系统中实现强大的合和高效的测量.
- 在更大的系统中探索量子现象,并实现量子信息传输.
主要方法:
- 将微机械膜嵌入到超导微波共振电路中,以增强机电相互作用.
- 在~10MHz微机械振荡器上使用侧带冷却技术.
- 执行接近海森伯格极限的位置测量,以验证语音占用.
主要成果:
- 成功地将微机械振荡器冷却到量子基本状态,声子占用率为0.34±0.05.
- 获得了接近海森伯格极限的位置测量 (5.1 ± 0.4) h/2π.
- 证明了强的合,使微波光子和机械声子之间能够连贯交换.
结论:
- 在宏观系统中同时实现了地面状态的准备,强的合和高效的测量.
- 该设备促进了控制和检测非经典运动状态的进步.
- 该系统提供了在新制度中测试量子理论的潜力,并充当量子信息接口.
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