QUINST events: seminars, workshops and conferences


Felix Huber, University of Siegen, Germany

When and where

12/09/2016 12/09/2016


Felix Huber, University of Siegen, Germany

Title: Absolutely maximally entangled states of seven qubits do not exist

Pure multiparticle quantum states are called absolutely maximally entangled if all reduced states obtained by tracing out at least half of the particles are maximally mixed. We provide a method to characterize these states for a general multiparticle system. With that, we prove that a seven-qubit state whose three-body marginals are all maximally mixed does not exist. Furthermore, we obtain an upper limit on the possible number of maximally mixed three-body marginals and identify the state saturating the bound. This solves the seven-particle problem as the last open case concerning maximally entangled states of qubits.