Статья

Probing entanglement in a many-body–localized system

Alexander LukinDepartment of Physics, Harvard University, Cambridge, MA 02138, USAMatthew RispoliDepartment of Physics, Harvard University, Cambridge, MA 02138, USARobert SchittkoDepartment of Physics, Harvard University, Cambridge, MA 02138, USAM. Eric TaiDepartment of Physics, Harvard University, Cambridge, MA 02138, USAAdam M. KaufmanDepartment of Physics, Harvard University, Cambridge, MA 02138, USASoonwon ChoiDepartment of Physics, Harvard University, Cambridge, MA 02138, USAVedika KhemaniDepartment of Physics, Harvard University, Cambridge, MA 02138, USAJulian LéonardDepartment of Physics, Harvard University, Cambridge, MA 02138, USAMarkus GreinerDepartment of Physics, Harvard University, Cambridge, MA 02138, USA

2019en

ABI

Аннотация

An interacting quantum system that is subject to disorder may cease to thermalize owing to localization of its constituents, thereby marking the breakdown of thermodynamics. The key to understanding this phenomenon lies in the system's entanglement, which is experimentally challenging to measure. We realize such a many-body-localized system in a disordered Bose-Hubbard chain and characterize its entanglement properties through particle fluctuations and correlations. We observe that the particles become localized, suppressing transport and preventing the thermalization of subsystems. Notably, we measure the development of nonlocal correlations, whose evolution is consistent with a logarithmic growth of entanglement entropy, the hallmark of many-body localization. Our work experimentally establishes many-body localization as a qualitatively distinct phenomenon from localization in noninteracting, disordered systems.

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Идентификаторы

DOI: 10.1126/science.aau0818

Цитирования и источники

Цитирований: 3Использованных источников: 0

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