# Heidelberg 2015 – wissenschaftliches Programm

## Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

# Q: Fachverband Quantenoptik und Photonik

## Q 43: Quantum Information: Concepts and Methods VI

### 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.