Probing entanglement in a many-body-localized system

Abstract

An interacting quantum system that is subject to disorder may cease to thermalize due to localization of its constituents, thereby marking the breakdown of thermodynamics. The key to our understanding of 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 non-local 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 non-interacting, disordered systems.

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• Equivalence of Spatial and Particle Entanglement Growth After a Quantum Quench
• Robust and Parallel Control of Many Qubits
• Entanglement Growth from Entangled States: A Unified Perspective on Entanglement Generation and Transport
• Diagnosing chaos with projected ensembles of process tensors
• From single-particle to many-body chaos in Yukawa--SYK: theory and a cavity-QED proposal
• Many-body localization in a slowly varying potential
• Long-range bipartite entanglement in XXZ spin chains with the exponential and power-law long-range interactions
• Beyond the imbalance: site-resolved dynamics probing resonances in many-body localization
• Many-body localization and particle multioccupancy in the disordered Bose-Hubbard model
• Pauli weight requirement of the matrix elements in time-evolved local operators: dependence beyond the equilibration temperature
• Entanglement signatures of a percolating quantum system
• Two-dimensional many-body localized systems coupled to a heat bath