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arXiv 0907.1635quant-ph
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容错量子逻辑门的最优控制实现

Implementation of Fault-tolerant Quantum Logic Gates via Optimal Control

R. Nigmatullin, S. G. Schirmer

摘要:

考虑了在编码逻辑量子比特上实现容错量子门的问题。结果表明,基于简单的几何控制思想的逻辑门的横向实现是有问题的现实的物理系统遭受的缺陷,如量子比特的不均匀性或量子比特之间的不可控的相互作用。然而,这个问题可以通过将任务表述为最优控制问题并设计有效的算法来解决,特别是,我们可以找到在固定时间内以有限的控制资源实现所有基本逻辑门的解决方案。最重要的是,即使对于理想系统,使用传统技术也极难实现的逻辑门,例如用于五量子位稳定器代码的T门,似乎不会对最佳控制造成问题。

英文摘要:

The implementation of fault-tolerant quantum gates on encoded logic qubits is considered. It is shown that transversal implementation of logic gates based on simple geometric control ideas is problematic for realistic physical systems suffering from imperfections such as qubit inhomogeneity or uncontrollable interactions between qubits. However, this problem can be overcome by formulating the task as an optimal control problem and designing efficient algorithms to solve it. In particular, we can find solutions that implement all of the elementary logic gates in a fixed amount of time with limited control resources for the five-qubit stabilizer code. Most importantly, logic gates that are extremely difficult to implement using conventional techniques even for ideal systems, such as the T-gate for the five-qubit stabilizer code, do not appear to pose a problem for optimal control.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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