在被困离子机械振荡器中编码量子位
C Flühmann1, T L Nguyen2, M Marinelli2
1Institute for Quantum Electronics, ETH Zürich, Zürich, Switzerland. christaf@phys.ethz.ch.
Nature
|March 1, 2019
概括
研究人员使用单个被困离子展示了一种新的量子错误校正方法. 这种方法将量子信息编码到波器中,实现逻辑状态和门的高保真性,为先进的量子计算和传感铺平了道路.
科学领域:
- 量子信息科学
- 量子计算
- 量子感应
背景情况:
- 稳定的量子计算机运行需要强大的量子错误校正.
- 量子错误纠正通常依赖于多个物理量子位或更高维的系统,
- 之前在波器中编码量子比特的建议在实验上具有挑战性.
研究的目的:
- 通过实验证明一个强大的量子错误编码方案在一个波器.
- 使用单个被困离子系统实现和控制编码的量子位.
- 探索量子错误纠正和量子传感中的应用.
主要方法:
- 使用单个被困的Ca+离子作为波器.
- 在量子比特编码中采用了多种压缩状态的叠加.
- 通过连接到辅助内部状态量子位来控制和测量机械振荡器.
主要成果:
- 成功准备和重建逻辑状态,平均正方位精度为87.3 ± 0.7%.
- 展示了具有高过程保真度 (大约) 的通用逻辑单量子位门集. 97%的保利门,89%的连续旋转).
- 在离散和连续变量操作中实现高保真度.
结论:
- 证明的控制方法提供了一个可行的连续变量量子错误校正路径.
- 这种技术使得混合量子信息方案能够结合离散和连续变量.
- 编码状态在量子传感中有直接应用,用于同时测量位置和动量.
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