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arXiv 1804.09486quant-ph
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开放系统量子纠错

Open-System Quantum Error Correction

Yink Loong Len, Hui Khoon Ng

摘要:

我们研究了量子纠错(QEC)在开放系统(OS)动力学系统上的性能。系统上的噪声源自系统-浴槽复合物上的联合量子信道,这是一种框架,其包括常用的仅系统量子噪声信道模型和系统-浴槽哈密顿噪声模型并在两者之间进行插值。我们推导出完美的OSQEC条件,QEC恢复只在系统上,而不是难以接近的浴。当噪声仅近似可校正时,感兴趣的一般情况下,我们使用最坏情况的保真度来量化OSQEC的性能。我们发现,从单位保真度恢复后的领先偏差是二次的不可校正的部分,结果让人想起过去的工作近似QEC系统的噪声,虽然这里的方法需要使用不同的技术比过去的工作。

英文摘要:

We study the performance of quantum error correction (QEC) on a system undergoing open-system (OS) dynamics. The noise on the system originates from a joint quantum channel on the system-bath composite, a framework that includes and interpolates between the commonly used system-only quantum noise channel model and the system-bath Hamiltonian noise model. We derive the perfect OSQEC conditions, with QEC recovery only on the system and not the inaccessible bath. When the noise is only approximately correctable, the generic case of interest, we quantify the performance of OSQEC using worst-case fidelity. We find that the leading deviation from unit fidelity after recovery is quadratic in the uncorrectable part, a result reminiscent of past work on approximate QEC for system-only noise, although the approach here requires the use of different techniques than in past work.

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