Mainz 2026 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 69: Collective Effects and Disordered Systems
Q 69.3: Talk
Friday, March 6, 2026, 11:30–11:45, P 2
Collective effects in cooling of ion crystals — •Ivan Vybornyi1 and Klemens Hammerer1,2 — 1Leibniz Universität Hannover — 2University of Innsbruck
Crystals of cold trapped ions are proven to be an outstanding platform to study controlled many-body physics and push the boundaries of quantum metrology. For this, careful entropy management is an essential prerequisite and laser cooling is routinely used to prepare the necessary low entropy mechanical motional states. However, with ion crystals increasing in size, the role of many-body effects in laser cooling has been largely overlooked and the possibility of collective enhancement remains unclear. In this work, we study a minimal theoretical many-body model for cooling arbitrary motional modes of an ion crystal and analyze the cooling behavior as more ions are added to the crystal. We identify regimes where the collective enhancement can provide a substantial boost to the cooling efficiency and discuss its advantages as well as limitations.
Keywords: trapped ions; collective effects; spin-boson model; ion cooling