Mainz 2017 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 41: Quantum Information: Concepts and Methods VI
Q 41.3: Talk
Thursday, March 9, 2017, 11:45–12:00, P 2
Randomized entanglement detection — •Jasmin D. A. Meinecke1,4,5, Lukas Knips1,4, Jan Dziewior1,4, Pete Shadbolt2, Joseph Bowles3, Nicolas Brunner3, Jeremy O'Brien5, and Harald Weinfurter1,4 — 1Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Str. 1, D-85748 Garching, Germany — 2Department of Physics, Imperial College London, SW7 2AZ, UK — 3Groupe de Physique Appliquée, Université de Genève, CH-1211 Genève, Switzerland — 4Fakultät für Physik, Ludwig-Maximilians-Universität München, D-80799 München, Germany — 5Centre for Quantum Photonics, H. H. Wills Physics Laboratory & Department of Electrical and Electronic Engineering, University of Bristol, Merchant Venturers Building, Woodland Road, Bristol, BS8 1UB, UK
Entangled particles exhibit quantum correlations over arbitrary long distances in time and space which cannot be mimicked by local realistic models. In order to detect and utilize these correlations for quantum information tasks, measurements in different bases are necessary. Schemes for experimentally characterizing quantum states have been devised, which are often experimentally demanding in terms of stability and insensitivity against noise. We show that entanglement detection is possible even under uncontrolled, unknown, local environmental noise on the quantum channel - a scenario under which established entanglement witnesses and tomography schemes fail - and demonstrate our new practical method by determining the degree of entanglement and purity of an unknown state using photonic multi-qubit states.