Hannover 2016 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 24: Ultracold plasmas and Rydberg systems II (with A)

Q 24.2: Vortrag

Dienstag, 1. März 2016, 14:45–15:00, f303

Pumping squeezed states of a micro-mechanical oscillator with Rydberg atoms. — •Robin Stevenson¹, Jiri Minar¹, Sebastian Hofferberth², and Igor Lesanovsky¹ — ¹School of Physics and Astronomy, The University of Nottingham, Nottingham NG7 2RD, United Kingdom — ²5. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany

We investigate a system comprising of a stream of Rydberg atoms passing close by a micro-mechanical oscillator. We show in the situation where the atomic transition is resonant with a single-phonon transition of the oscillator, this system is equivalent to a micromaser, realised for example by atoms passing one by one through a cavity. This in principle allows the observation of a lasing transition and the creation of coherent states.

Furthermore, we demonstrate that when the atoms are on resonance with a two-phonon transition of the oscillator we can generate non-classical states in the oscillator. In the small interaction limit, the oscillator is driven towards coherent superpositions of coherent states with opposite sign. In the presence of thermal coupling the oscillator is driven towards squeezed states that can have variance lower than the vacuum state. Finally, we discuss experimental parameters and explore whether the non-classical states discussed here are achievable with current technology.