Freiburg 2024 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 37: Poster III
Q 37.11: Poster
Wednesday, March 13, 2024, 17:00–19:00, Tent B
Dilute measurement-induced cooling into many-body ground states — •Josias Langbehn1, Kyrylo Snizhko2, Igor Gornyi3, Giovanna Morigi4, Yuval Gefen5, and Christiane Koch1 — 1Freie Universität Berlin, Berlin, Germany — 2Université Grenoble Alpes, Grenoble, France — 3Karlsruhe Institute of Technology, Karlsruhe, Germany — 4Saarland University, Saarbrücken, Germany — 5Weizmann Institute of Science, Rehovot, Israel
Cooling a quantum system to its ground state is important for the characterization of non-trivial interacting systems, and in the context of a variety of quantum information platforms. In principle, this can be achieved by employing measurement-based passive steering protocols, where the steering steps are predetermined and are not based on measurement readouts. However, measurements, i.e., coupling the system to auxiliary quantum degrees of freedom, is rather costly, and protocols in which the number of measurements scales with system size will have limited practical applicability. Here, we identify conditions under which measurement-based cooling protocols can be taken to the dilute limit. For two examples of frustration-free one-dimensional spin chains, we show that steering on a single link is sufficient to cool these systems into their unique ground states. We corroborate our analytical arguments with finite-size numerical simulations and discuss further applications.
Keywords: Reservoir engineering; open quantum systems; state preparation