17-22 July 2022
Royal Conservatory of Music, Toronto
America/Toronto timezone

Ultrafast Rydberg experiments with ultracold atoms in optical tweezers

18 Jul 2022, 17:00
1h 30m
Hart House (Hart House)

Hart House

Hart House

7 Hart House Cir, Toronto, ON M5S 3H3
Poster presentation Trapped ions, Rydberg atoms, and cold plasmas Poster session

Description

Rydberg atoms, with their giant electronic orbitals, exhibit dipole-dipole interaction reaching the GHz range at a distance of a micron, making them a prominent contender for realizing ultrafast quantum operations. However, such strong interactions between single atoms have never been harnessed so far because of the stringent requirements on the fluctuation of the atom positions and the necessary excitation strength. Here, we introduce novel techniques to explore this regime [1]. First, we trap and cool atoms to the motional quantum ground-state of holographic optical tweezers allowing to control the inter-atomic distance down to 1.5 µm with a quantum-limited precision of 30 nm. Then, we use ultrashort laser pulses to excite a pair of these close-by atoms to a Rydberg state simultaneously, far beyond the Rydberg blockade regime [2], and perform Ramsey interferometry with attosecond precision. This allows us to induce and track an ultrafast interaction-driven energy exchange completed on a timescale of nanoseconds, two orders of magnitude faster than in any other Rydberg experiments with individual atoms. This ultrafast coherent dynamic gives rise to a conditional phase which is the key resource for a quantum gate, opening the path for quantum simulation [2] and computation operating at the speed-limit set by dipole-dipole interactions with this ultrafast Rydberg platform.

[1] Y. Chew et al., arXiv: 2111.12314
[2] V. Bharti et al., arXiv : 2201.09590

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Presenter name Sylvain DE LESELEUC

Primary author

Sylvain DE LESELEUC (Institute for Molecular Science (Japan))

Co-authors

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