# Heidelberg 2015 – wissenschaftliches Programm

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# Q: Fachverband Quantenoptik und Photonik

## Q 35: Quantum Information: Concepts and Methods V

### Q 35.8: Vortrag

### Mittwoch, 25. März 2015, 12:45–13:00, K/HS1

**Observables and the structure of entanglement for discrete and continuous-variable systems** — •Kedar S. Ranade — Institut für Quantenphysik, Universität Ulm

The concept of entanglement as a resource in quantum information processing is related to the accessible observables in a physical system. This is manifested by the fact that in finite-dimensional systems the amount of entanglement may be changed arbitrarily by tailoring the observables [1]. Such concepts can be extended to continuous-variable systems, which are most conveniently described by Wigner functions [2]. Here we show that the amount of entanglement in continuous-variable systems can change with respect to various systems of observables and how this change can be understood. We also present some examples of how this may appear in physical situations.

[1] N. L. Harshman, K. S. Ranade, Phys. Rev. A **84** (2011), 012303

[2] N. Grimmer, Bachelor thesis (2014)