Freiburg 2019 – wissenschaftliches Programm
FM 11.4: Talk
Montag, 23. September 2019, 15:00–15:15, 2004
Detection of Genuine Multipartite Entanglement Without Any Reference Frames — •Jan Dziewior1,2, Lukas Knips1,2, Waldemar Klobus3, Wieslaw Laskowski3, Tomasz Paterek4,5, Harald Weinfurter1,2, and Jasmin Meinecke1,2 — 1Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Straße 1, 85748 Garching, Germany — 2Department für Physik, Ludwig-Maximilians-Universitaät, 80797 München, Germany — 3Institute of Theoretical Physics and Astrophysics, University of Gdansk, 80-308 Gdansk, Poland — 4School of Physical and Mathematical Sciences, Nanyang Technological University, 637371 Singapore — 5MajuLab, CNRS-UCA-SU-NUS-NTU International Joint Research Unit, UMI 3654 Singapore
Quantum entanglement is usually revealed by a carefully chosen set of measurements. Under a number of experimental conditions, especially for communication in multiparty quantum networks, the relative measurement directions fluctuate and are hard to calibrate. Yet, even with absolutely random measurements one can still gain information about the state and its entanglement. Here we extend previous attempts and perform numerical as well as experimental analysis of the performance of the method. From detailed distributions of measurement outcomes and their correlations different types of multipartite entanglement are identified making our method useful for entanglement verification in the presence of noise. It overcomes any type and strength of localized unitary noise as long as the rate of entanglement generation is sufficiently high.