Erlangen 2022 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 4: Quantum Information (Concepts and Methods) I

Q 4.6: Talk

Monday, March 14, 2022, 15:15–15:30, Q-H12

Quantum simulations in a linear Paul trap and a 2D array — •Florian Hasse, Deviprasath Palani, Apurba Das, Lennart Guth, Ingolf Kaufmann, Ulrich Warring, and Tobias Schaetz — Physikalisches Institut, University of Freiburg

Trapped ions present a promising platform for quantum simulations [1]. In our laboratory in Freiburg, we are performing experiments on multiple ions trapped in a linear or a surface RF-trap. In our linear Paul trap, we switch the trapping potential sufficiently fast to induce a non-adiabatic change of the ions' motional mode frequencies. Thereby, we prepare the ions in a squeezed state of motion. This process is accompanied by the formation of entanglement in the ions' motional degree of freedom and can be interpreted as an experimental analogue to the particle pair creation during cosmic inflation in the early universe [2]. Furthermore, we will transfer entanglement of the motional degree of freedom to the external degree of freedom. In our basic triangular array of individually trapped ions with 40 um inter-site distance, we realize the coupling between ions at different sites via their Coulomb interactions. We demonstrate its tuning in real-time and show interference of coherent states of currently large amplitudes [3]. In addition, we employ the individual control for local modulation of the trapping potential to realize Floquet-engineered coupling of adjacent sites [4].

[1] T. Schaetz et al., New J. Phys. 15, 085009 (2013).

[2] M. Wittemer et al., Phys. Rev. Lett. 123, 180502 (2019).

[3] F. Hakelberg et al., Phys. Rev. Lett. 123, 100504 (2019).

[4] P. Kiefer et al., Phys. Rev. Lett. 123, 213605 (2019).