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使用离散变量编码的逻辑量子位击败平衡点
Zhongchu Ni1,2,3, Sai Li1,2, Xiaowei Deng1,2
1Shenzhen Institute for Quantum Science and Engineering, Southern University of Science and Technology, Shenzhen, China.
Nature
|March 23, 2023
概括
研究人员使用微波腔保护逻辑量子位来演示量子错误校正 (QEC). 这种方法提高了量子比特的寿命, 超出了平衡点, 推进了容错的量子计算.
科学领域:
- 量子信息科学
- 量子计算
- 量子错误纠正
背景情况:
- 量子错误校正 (QEC) 对于保护量子信息免受噪声的影响至关重要.
- 目前的QEC代码通常使用离散变量,但将逻辑量子比特的寿命延长到物理量子比特之外仍然是一个挑战.
- 实现这个平衡点对于实际的量子计算至关重要.
研究的目的:
- 展示一个超越平点的量子错误校正程序.
- 提高编码逻辑量子位的使用寿命.
- 展示离散变量编码在容错量子计算中的潜力.
主要方法:
- 使用电路量子电力学架构.
- 在微波腔的光子数态中使用逻辑量子位的二项编码.
- 应用一个定制的频率脉冲到辅助超导量子比特的错误综合征提取和反控制.
主要成果:
- 成功证明QEC程序超过了平衡点.
- 在逻辑量子位的寿命中大约提高了16%.
- 展示了高保真度错误综合征提取和反控制.
结论:
- 开发的QEC程序成功地将逻辑量子比特的寿命延长到物理量子比特的极限.
- 硬件高效的离散变量编码显示出对容错量子计算的重大承诺.
- 这项工作是朝着实际的量子错误纠正迈出的关键一步.
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