Berlin 2014 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 64: Quantum information: Concepts and methods V
Q 64.6: Talk
Friday, March 21, 2014, 15:15–15:30, Kinosaal
Optimized state independent entanglement detection — •Christian Schwemmer1,2, Wieslaw Laskowski3, Daniel Richart1,2, Lukas Knips1,2, Tomasz Paterek4,5, and Harald Weinfurter1,2 — 1Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Straße 1, D-85748 Garching, Germany — 2Department für Physik, Ludwig-Maximilians-Universität, D-80797 München, Germany — 3Institute of Theoretical Physics and Astrophysics, University of Gdańsk, PL-80-952 Gdańsk, Poland — 4School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore — 5Centre for Quantum Technologies, National University of Singapore, Singapore
Entanglement lies in the very heart of quantum mechanics and is considered a key resource for many promising quantum information tasks like quantum cryptography or quantum computing. Therefore, tools for the rapid detection of entanglement are highly desirable. Here, we present two schemes [1,2] that are based on a simple entanglement criterion using accessible correlations between the measurement results and the principle of
correlation complementarity.
The first one essentially implements Schmidt decomposition of pure two-qubit states but without requiring a shared reference frame. The second one uses a decision tree to detect entanglement with as few measurements as possible and can also be generalized to multi-qubit states. We demonstrate their experimental applicability for mixed and multi qubit states.
Laskowski et al., Phys. Rev. Lett. 108, 240501 (2012)
Laskowski et al., Phys. Rev. A 88, 022327 (2013)