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使用超导电路实现三量子比特量子错误校正.
M D Reed1, L DiCarlo, S E Nigg
1Department of Physics, Yale University, New Haven, Connecticut 06520, USA. matthew.reed@yale.edu
Nature
|February 3, 2012
概括
研究人员使用超导电路中的三量子比特代码演示了量子错误校正. 这种方法纠正了比特翻转和阶段翻转错误,为更强大,更可扩展的量子计算机铺平了道路.
科学领域:
- 量子计算是一种量子计算.
- 量子错误纠正方法 量子错误纠正方法
- 超导电路中的超导电路
背景情况:
- 量子计算机提供指数加速度,但容易出现错误.
- 量子错误纠正代码对于保持量子连贯性至关重要.
- 三量子比特代码是最简单的形式,将一个量子比特编码为三个.
研究的目的:
- 为了展示超导电路中的相位和位翻转错误纠正代码.
- 为了实现一个三量子比特门用于错误纠正.
- 为了表现出对错误的第一级不敏感.
主要方法:
- 将一个量子状态编码为一个三量子位纠状态.
- 诱导单量子位错误 (比特翻转和相位翻转).
- 解读错误综合征并应用一个纠正的三量子比特门 (Toffoli gate).
主要成果:
- 在Toffoli门的经典动作中,获得了85±1%的保真度.
- 为理想的量子过程矩阵实现了78±1%的保真度.
- 正如预测的那样,表现出对错误的第一级不敏感性.
结论:
- 实施的三量子比特代码有效地纠正单量子比特错误.
- 这种方法在与改进的连贯时间相结合时,显示出可扩展量子技术的前景.
- 在一个九量子比特设备上的代码的连接可以纠正任意的单量子比特错误.
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