# Mainz 2017 – wissenschaftliches Programm

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# Q: Fachverband Quantenoptik und Photonik

## Q 53: Poster: Quantum Optics and Photonics III

### Q 53.59: Poster

### Donnerstag, 9. März 2017, 17:00–19:00, P OG2

**Quantum simulators for open quantum systems using quantum Zeno dynamics** — •Sabrina Patsch and Christiane P. Koch — Universität Kassel, Deutschland

A watched quantum arrow does not move. This effect, referred to as the quantum Zeno effect, arises from a frequent measurement of a quantum system’s state. In more general terms, the evolution of the quantum system can be confined to a subspace of the system’s Hilbert space leading to quantum Zeno dynamics. Resulting from the measurement process, a source of dissipation is introduced into the systems dynamics. However, different than for a common open quantum system, we can choose the strength of the dissipation by changing the parameters of the Zeno measurement.

We capitalise on the property of tunable dissipation to create a quantum simulator for open quantum systems. Due to the formal analogy of the measurement process and the theory of open quantum systems, we can derive a Lindblad master equation to describe the evolution of the open quantum system. Moreover, we extend the picture to enable also non-Markovian evolution in the quantum simulator.

The considered quantum system are photons inside a cavity being subject to a indirect measurement using circular Rydberg atoms. The setup is inspired by Zeno experiments proposed in the framework of cavity quantum electrodynamics [1].

[1] Raimond et al. Quantum Zeno dynamics of a field in a cavity.*Phys. Rev. A* 86, 032120 (2012)