Berlin 2014 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 71: Quantum information: Concepts and methods VI
Q 71.6: Vortrag
Freitag, 21. März 2014, 17:45–18:00, Kinosaal
Entanglement and observables for continuous-variable systems — •Kedar S. Ranade, Nico Grimmer, and Wolfgang P. Schleich — Institut für Quantenphysik, Universität Ulm, and Center for Integrated Quantum Science and Technology (IQST)
In finite-dimensional quantum systems it is known that the amount of entanglement in the system is fundamentally related to the set of accessible operations: any pure state can be interpreted to have any amount of entanglement, if this entanglement is defined with respect to an appropriate system of observables [1].
In this talk we present an extension to continuous-variable systems. Such systems can most conveniently be described in terms of their quasi-classical Wigner functions. The Wigner function is a representation of the density operator, and the transformations (such as the time evolution) correspond to symplectic maps. We analyse the behaviour of entanglement under such transformations for generic states.
[1] N. L. Harshman, K. S. Ranade, Phys. Rev. A 84 (2011), 012303