Freiburg 2024 – scientific programme

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A: Fachverband Atomphysik

A 35: Poster VIII

A 35.7: Poster

Thursday, March 14, 2024, 17:00–19:00, Tent C

cryogenic strontium quantum processor — •Valerio Amico, Jackson Angonga, Roberto Franco, Xintong Su, and Christian Gross — University of Tuebingen

Optical tweezers lattices hosting neutral Rydberg atoms are a promising platform for quantum computing and simulation. However, the most demanding challenge consists in mitigating noise due to environmental coupling. In our ongoing project, we propose a pioneering approach that involves creating optical tweezer lattices, based in fermionic strontium 87, in a cryogenic environment at 4K. The use of a closed-cycle cryostat will provide an extremely high vacuum (XHV) environment of 1e-12 mbar which will reduce atom loss due to background gas and increase the atom lifetime in trap beyond 10 min thus enabling the assembly of larger arrays. Furthermore, operating at cryogenic temperatures will markedly reduce black-body radiation (BBR) and consequently reduce BBR-induced transitions between Rydberg levels. This will increase Rydberg lifetime and improve the fidelity of entangling gates and qubit coherence. In addition to shielding provided by the 4K copper case, the cryogenic environment enables the usage of superconducting coils, which offer outstanding passive stability of the magnetic field and thereby increases the qubit coherence. In this presentation we will showcase initial trapping and cooling of Sr-87 in our vacuum chamber, the design and construction of our cryogenic chamber and our current efforts towards cooling and transport of atoms into the cryostat.

Keywords: Strontium; Cryostat; Quantum simulation; Rydberg; Optical tweezers lattice