Hannover 2020 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 36: Ultracold plasmas and Rydberg systems I (joint session Q/A)

Q 36.3: Talk

Wednesday, March 11, 2020, 14:30–14:45, f342

Vanishing-polarizability states of trappd Rydberg ions — •Fabian Pokorny, Chi Zhang, Gerard Higgins, and Markus Hennrich — Department of Physics, Stockholm University, 10691 Stockholm, Sweden

Trapped Rydberg ions are a novel approach for quantum information processing [1]. By combining the high degree of control of trapped ion systems with the long-range dipolar interactions of Rydberg atoms [2], fast entanglement gates may be realized in large ion crystals [1,3].

Recently, we carried out a controlled-phase gate in a two-ion crystal with a gate time of 700ns and more than 70% entaglement fidelity [4]. In order to implement such a gate in large or even multidimensional ion crystals, Rydberg states with vanishing polarizability may be crucial to mitigate otherwise considerable line-broadening caused by phonon-dependent energy shifts of bare Rydberg states [4, 5]. Here we report the realization of microwave-dressed Rydberg states with vanishing polarizability. We observed negligible energy shifts even in presence of excess micro-motion and performed Rabi oscillations between low-lying electronic states and vanishing-polarizability Rydberg states with only Doppler cooling.

[1] M. Müller, et al., New J. Phys. 10, 093009 (2008)

[2] D. Jaksch, et al., Phys. Rev. Lett. 85, 2208 (2000)

[3] F. Schmidt-Kaler, et al., New J. Phys. 13, 075014 (2011)

[4] C. Zhang, et al., arXiv:1908.11284 (2019)

[5] G. Higgins, et al., Phys. Rev. Lett. 123, 153602 (2019)