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arXiv 0902.2478quant-ph
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一般开放量子系统的映射和线性量子纠错理论

Maps for general open quantum systems and a theory of linear quantum error correction

A. Shabani, D. A. Lidar

摘要:

我们证明了一个开放量子系统的量子子动力学总是可以用厄米映射来描述,而与系统初始态的形式无关。由于量子纠错理论是基于完全正(CP)映射的假设而发展起来的,我们提出了一个广义的线性量子纠错理论,它适用于描述开放系统演化的任何线性映射.在厄米映射的物理相关的设置,我们表明,CP-映射为基础的版本的量子纠错理论适用于没有修改。然而,我们表明,一个更一般的情况下也是可能的,恢复地图是厄米,但不是CP。由于非CP映射在其值域内具有非正定矩阵,我们给出了一般线性映射正性域的一个几何刻画。特别是,我们表明,这个域是凸的,这意味着一个简单的算法,找到它的边界。

英文摘要:

We show that quantum subdynamics of an open quantum system can always be described by a Hermitian map, irrespective of the form of the initial total system state. Since the theory of quantum error correction was developed based on the assumption of completely positive (CP) maps, we present a generalized theory of linear quantum error correction, which applies to any linear map describing the open system evolution. In the physically relevant setting of Hermitian maps, we show that the CP-map based version of quantum error correction theory applies without modifications. However, we show that a more general scenario is also possible, where the recovery map is Hermitian but not CP. Since non-CP maps have non-positive matrices in their range, we provide a geometric characterization of the positivity domain of general linear maps. In particular, we show that this domain is convex, and that this implies a simple algorithm for finding its boundary.

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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