关于暴露的正映射：Robertson和Breuer-Hall映射
On exposed positive maps: Robertson and Breuer-Hall maps
摘要：
众所周知，纠缠理论中使用的所谓Breuer-Hall正映射是最优的。我们表明这些地图具有更微妙的属性--它们是暴露的。作为一个副产品，它证明了在4x 4复矩阵代数中的罗伯逊映射不仅是极端的，这已经被罗伯逊证明，但也暴露。
英文摘要：
It is well known that so called Breuer-Hall positive maps used in entanglement theory are optimal. We show that these maps possess much more subtle property --- they are exposed. As a byproduct it proves that a Robertson map in the algebra of 4 x 4 complex matrices is not only extreme, which was already shown by Robertson, but also exposed.
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。
