在超导量子位上动态生成无脱凝的子空间和子系统
Gregory Quiroz1,2, Bibek Pokharel3,4, Joseph Boen1
1Johns Hopkins University Applied Physics Laboratory, Laurel, MD 20723, United States of America.
概括
研究人员在量子处理器上使用动态解 (DD) 实验证明了无脱节性子系统 (DFS) 逻辑量子比特. 与单独DD相比,这种方法提高了23%的量子状态保存保真度,提高了计算精度.
科学领域:
- 量子信息科学 量子信息科学
- 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
背景情况:
- 无脱凝的子空间和子系统 (DFS) 通过将量子信息编码到对称性保护状态中来保护量子信息,从而抵抗环境噪声.
- 实验系统可能缺乏固有的DFS,需要引发它们的方法.
- 动态解 (DD) 是一种技术,用于通过应用控制脉冲的序列来减轻脱节.
研究的目的:
- 首次通过实验证明动态解产生的无脱节的子系统逻辑量子比特.
- 调查DFS代码在超导量子处理器上保存量子信息方面的性能.
- 评估DFS逻辑量子比特所提供的忠实性改进,与DD下的物理量子比特相比.
主要方法:
- 使用IBM量子超导处理器来实现两位和三位量子比特DFS代码.
- 采用动态解 (DD) 技术来设计支持DFS的对称性.
- 结合DD与错误检测机制来评估DFS逻辑量子比特的性能.
主要成果:
- 在DFS逻辑量子比特的状态保存忠实度上实现了高达23%的改进,而不是仅仅接受DD的物理量子比特.
- 对于 DFS 编码的量子比特来说,已经证明了超出平衡的忠实度改进,这意味着取得了重大进展.
- 研究的DFS代码包括多达6和7个不相互作用的逻辑量子比特.
结论:
- 动态脱可以有效地用于生成量子信息编码的无脱子系统.
- 在量子处理器中,DFS代码为提高量子处理器的计算精度提供了一个有希望的途径.
- 实验演示验证了DFS代码对于强大的量子计算的潜在实用性.
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