Representability Conditions and Correlations

为继续进行“可表征性条件和相关性”研究项目（该项目在物理学中有应用），申请再资助一年。计划博士研究员通过研究Bogolubov变换下这些条件的商，继续分析简化的1-和2-原子密度矩阵的可表示性条件。他进一步计划定义一个度量，允许测量给定费米子算子到最近的可表示密度矩阵的距离，从而将可表示性重新表述为几何近似问题。

For the continuation of the research project "Representability Conditions and Correlations" which has applications in physics, for one more year financial support is applied for.It is planned that the doctoral researcher continues his analysis of the representability condition for reduced 1- and 2-fernion density matrices by studying the quotient of these conditions under Bogolubov tranformations.It is further planned that he defines a metric that allows to measure the distance of a given fermion operator to the closest representable density matrix, thus reformulating representability as a geometric approximation problem.