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QI: Fachverband Quanteninformation

QI 10: Quantum Information: Concepts and Methods I

QI 10.8: Vortrag

Mittwoch, 11. März 2026, 11:45–12:00, BEY/0137

The three kinds of three-qubit entanglement — •Szilárd Szalay — Wigner Research Centre for Physics, Budapest, Hungary

We construct an important missing piece in the entanglement theory of pure three-qubit states, which is a polynomial measure of W entanglement, working in parallel to the three-tangle, which is a polynomial measure of GHZ entanglement, and to the bipartite concurrence, which is a polynomial measure of bipartite entanglement. We also show that these entanglement measures are ordered, the bipartite measure is larger than the W measure, which is larger than the GHZ measure. It is meaningful then to consider these three types of three-qubit entanglement, which are also ordered, bipartite is weaker than W, which is weaker than GHZ, in parallel to the order of the three equivalence classes of entangled three-qubit states.

Keywords: entanglement measures; three qubits