Heidelberg 2015 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 35: Quantum Information: Concepts and Methods V
Q 35.1: Talk
Wednesday, March 25, 2015, 11:00–11:15, K/HS1
Minimal Experimental Multipartite Entanglement Detection — •Lukas Knips1,2, Christian Schwemmer1,2, Nico Klein1,2, Marcin Wieśniak3, and Harald Weinfurter1,2 — 1Department für Physik, LMU, D-80797 München — 2MPI für Quantenoptik, D-85748 Garching — 3Institute of Theoretical Physics and Astrophysics, University of Gdańsk, PL-80-952 Gdańsk, Poland
Certifying entanglement in a multipartite state is a demanding task.
As a state of N qubits is parametrized by 4N−1 real numbers, one may expect that the measurement complexity of generic entanglement detection is also exponential with N.
However, in special cases we can design indicators for genuine multipartite quantum entanglement using measurements in only two settings.
We describe the general method of deriving such criteria, which are based on a more general entanglement criterion [1] using correlation measurements.
In the experiment we test two such non-linear witnesses, one constructed for four-qubit GHZ states, the other for Cluster states |C4⟩.
P. Badziag et al., PRL 100, 140403 (2008).