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Article Dans Une Revue PRX Quantum Année : 2023

Dilute measurement-induced cooling into many-body ground states

Josias Langbehn
  • Fonction : Auteur
Kyrylo Snizhko
Igor Gornyi
  • Fonction : Auteur
Christiane Koch
  • Fonction : Auteur

Résumé

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.
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Dates et versions

hal-04532488 , version 1 (04-04-2024)
hal-04532488 , version 2 (23-08-2024)

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Josias Langbehn, Kyrylo Snizhko, Igor Gornyi, Giovanna Morigi, Yuval Gefen, et al.. Dilute measurement-induced cooling into many-body ground states. PRX Quantum, 2023, ⟨10.48550/arXiv.2311.05258⟩. ⟨hal-04532488v2⟩
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