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arXiv 2010.04048quant-ph
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子空间中的量子测量不相容性

Quantum measurement incompatibility in subspaces

Roope Uola, Tristan Kraft, Sébastien Designolle, Nikolai Miklin, Armin Tavakoli, Juha-Pekka Pellonpää, Otfried Gühne, Nicolas Brunner

摘要:

我们考虑高维量子测量集合的不相容性的特征问题。我们在子空间中引入度量不相容的概念。也就是说,从一组不相容的测量开始,考虑通过投影到任何固定维度的严格子空间上获得的测量集。我们确定了子空间中不相容性的三种可能形式:(i)不可压缩不相容性:在每个子空间中变得相容的测量,(ii)完全可压缩不相容性:在每个子空间中保持不相容的测量,以及(iii)部分可压缩不相容性:在某些子空间中相容而在另一个子空间中不相容的测量。对于每个类,我们讨论明确的例子。最后,我们提出了这些想法的一些应用。首先,我们表明,联合可测性和共存是两个不兼容的概念在最简单的情况下的量子比特系统。其次,我们强调了我们的结果的量子操纵测试的影响。

英文摘要:

We consider the question of characterising the incompatibility of sets of high-dimensional quantum measurements. We introduce the concept of measurement incompatibility in subspaces. That is, starting from a set of measurements that is incompatible, one considers the set of measurements obtained by projection onto any strict subspace of fixed dimension. We identify three possible forms of incompatibility in subspaces: (i) incompressible incompatibility: measurements that become compatible in every subspace, (ii) fully compressible incompatibility: measurements that remain incompatible in every subspace, and (iii) partly compressible incompatibility: measurements that are compatible in some subspace and incompatible in another. For each class we discuss explicit examples. Finally, we present some applications of these ideas. First we show that joint measurability and coexistence are two inequivalent notions of incompatibility in the simplest case of qubit systems. Second we highlight the implications of our results for tests of quantum steering.

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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