Hannover 2013 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 67: Quantum information: Concepts and methods V
Q 67.8: Talk
Friday, March 22, 2013, 15:45–16:00, E 214
Efficient State Analysis and Entanglement Detection — •C. Schwemmer1,2, G. Tóth3,4,5, D. Richart1,2, T. Moroder6, W. Laskowski7, L. Knips1,2, O. Gühne6, and H. Weinfurter1,2 — 1MPI für Quantenoptik, D-85748 Garching — 2Ludwig-Maximilians-Universität, D-80797 München — 3University of the Basque Country, E-48080 Bilbao — 4IKERBASQUE, E-48011 Bilbao — 5Wigner Research Centre, H-1525 Budapest — 6Universität Siegen, D-57068 Siegen — 7University of Gdańsk, PL-80-952 Gdańsk
Multi-partite entangled quantum states offer great opportunities with potential applications in quantum information processing. Therefore, practical tools for entanglement detection and characterization are needed. However, conventional state tomography suffers from an exponentially increasing measurement effort with the number of qubits. In contrast, low rank or symmetric states like W, Dicke or GHZ states enable tomographic analysis at polynomial effort [1,2]. Here, we apply these schemes to experimentally analyze four and six photon symmetric Dicke states. For data processing a fitting algorithm based on convex optimization is used offering significant improvements in terms of speed and accuracy [3]. It is further studied how the principle of correlation complementarity can be applied to detected entanglement with few measurements and to speed up quantum state tomography [4].
Tóth et al., Phys. Rev. Lett. 105, 250403 (2010)
Gross et al., Phys. Rev. Lett. 105, 150401 (2010)
Moroder et al., New J. Phys. 14, 105001 (2012)
Laskowski et al., Phys. Rev. Lett. 108, 240501 (2012)