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SYQE: Symposium Quantum Correlations Beyond Entanglement

SYQE 2: Quantum Correlations Beyond Entanglement II

SYQE 2.4: Hauptvortrag

Dienstag, 18. März 2014, 18:00–18:30, Kinosaal

The quantum marginal problem — Matthias Christandl and •Michael Walter — ETH Zurich

Given a set of local density matrices, are they compatible? That is, could they arise from a joint global state? This question is known as the quantum marginal problem and is of importance in many aspects of quantum theory ranging from quantum chemistry (here known as the N-representability problem) to quantum information theory. In this talk, I will give an overview over recent progress on this problem and highlight some unexpected relations of this problem to the representation theory of the symmetric group and of Lie groups as well as the P versus NP conjecture of computational complexity.