通过连接的玻色子量子位进行硬件高效的量子错误校正
Harald Putterman1, Kyungjoo Noh2, Connor T Hann2
1AWS Center for Quantum Computing, Pasadena, CA, USA. putterma@amazon.com.
Nature
|February 26, 2025
概括
研究人员使用连接的玻色子代码开发了一种硬件效率高的量子错误校正方法. 这种方法显著减少逻辑量子比特的错误,为容错量子计算铺平了道路.
科学领域:
- 量子计算
- 量子错误纠正
- 超导电路
背景情况:
- 量子计算机需要用于实际应用的量子错误校正, 但目前的方法具有很高的物理量子比特开销.
- 硬件高效的方法对于扩展量子计算至关重要.
研究的目的:
- 实现逻辑量子比特内存使用连接的玻色子代码以提高硬件效率.
- 调查这个新的错误纠正策略的性能和扩展.
主要方法:
- 使用超导量子电路实现连接的玻色子猫量子位与外部重复代码 (距离d=5).
- 采用稳定电路对比特翻转的被动保护,以及用于阶段翻转的安西拉传输.
- 展示了 cat-transmon 系统的噪声偏差 CX 门,以抑制逻辑位翻转错误.
主要成果:
- 实现了一个逻辑量子比特内存, 具有低于误差值的相反校正重复代码.
- 通过增加猫量子比特平均光子数来抑制逻辑比特翻转错误.
- 测量最小逻辑错误率为距离-3的1.75%和距离-5的1.65%.
结论:
- 连接的玻色子代码提供了一个硬件高效的途径来实现容错量子计算.
- 玻色编码的内在错误抑制是使用高效的外部纠错代码的关键.
- 这种方法对构建可扩展和强大的量子计算机具有前景.
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