Description

S eminar talk by Felix Huber, University of Siegen, Germany,
on Thursday, 7 July, 2016, at 12:00 in the seminar room of the Department of Theoretical Physics.

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Characterizing ground and thermal states of few-body Hamiltonians
Felix Huber, University of Siegen, Germany

The question whether a given quantum state is a ground or thermal state of a few-body Hamiltonian can be used to characterize the complexity of the state and is important for possible experimental implementations.  We provide methods to characterize the states generated by two- and, more generally, k-body Hamiltonians as well as the convex hull of these sets. This leads to new insights into the question which states are uniquely  determined by their marginals and to a generalization of the concept of entanglement. Finally, certification methods for quantum simulation can be derived.