Heidelberg 2015 – wissenschaftliches Programm
Q 43.3: Vortrag
Mittwoch, 25. März 2015, 15:00–15:15, K/HS1
Characterisation of multiparticle correlations with exponential families — •Felix Huber — Theoretical Quantum Optics, University Siegen
Irreducible k-particle correlations are based on the information that is contained in the reduced k-particle density matrices, which is not already contained in the (k-1)-particle reduced states. By a dual structure, irreducible correlations also characterise a state by its relative entropy distance to thermal states of k-particle Hamiltonians. The interaction structure of the Hamiltonian can then be used to describe the complexity of multiparticle systems and the correlations present, as well as to identify thermal states of k-particle Hamiltonians. Here, we will present witnesses to exclude that a state is a thermal or ground state of a 2-particle Hamiltonian in the case 5 of qubits.