arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2104.02616math.DGmath.FAmath.MG
收藏

Grassmannian几何与量子态的最优输运

Geometry of Grassmannians and optimal transport of quantum states

Paolo Antonini, Fabio Cavalletti

摘要:

设$\mathsf{H}$是可分的Hilbert空间.我们证明了$\mathsf{H}$的有限维子空间的Grassmannian $\mathsf{P}_c(\mathsf{H})$是一个非负曲率的Alexandrov空间,并利用它的度量几何发展了线性有界算子的von Neumann代数$\mathsf{B}(\mathsf{H})$的正规态的最优输运理论.将密度矩阵视为$\mathsf{P}_c(\mathsf{H})$上的离散概率测度(通过谱定理),我们定义了正常状态的最优输运成本和Wasserstein距离。特别是,我们得到的成本,导致$w^*$ -拓扑。我们的结构是兼容的量子力学方法的组合系统的张量积$\mathsf{H}\otimes \mathsf{H}$。我们确实提供了一个解释的纯正常状态的$\mathsf{B}(\mathsf{H}\otimes \mathsf{H})$作为家庭的运输地图。这也定义了一个纯粹的正常状态的$\mathsf{B}(\mathsf{H}\otimes \mathsf{H})$的瓦瑟斯坦成本,调和与我们的建议。

英文摘要:

Let $\mathsf{H}$ be a separable Hilbert space. We prove that the Grassmannian $\mathsf{P}_c(\mathsf{H})$ of the finite dimensional subspaces of $\mathsf{H}$ is an Alexandrov space of nonnegative curvature and we employ its metric geometry to develop the theory of optimal transport for the normal states of the von Neumann algebra of linear and bounded operators $\mathsf{B}(\mathsf{H})$. Seeing density matrices as discrete probability measures on $\mathsf{P}_c(\mathsf{H})$ (via the spectral theorem) we define an optimal transport cost and the Wasserstein distance for normal states. In particular we obtain a cost which induces the $w^*$-topology. Our construction is compatible with the quantum mechanics approach of composite systems as tensor products $\mathsf{H}\otimes \mathsf{H}$. We provide indeed an interpretation of the pure normal states of $\mathsf{B}(\mathsf{H}\otimes \mathsf{H})$ as families of transport maps. This also defines a Wasserstein cost for the pure normal states of $\mathsf{B}(\mathsf{H}\otimes \mathsf{H})$, reconciling with our proposal.

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。

↑