Journal
NATURE PHYSICS
Volume 12, Issue 10, Pages 907-911Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/NPHYS3783
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Funding
- ARO Atomic
- Molecular Physics Program
- AFOSR MURI on Quantum Measurement and Verification
- IARPA MQCO Program
- NSF Physics Frontier Center
- Deutsche Akademie der Naturforscher Leopoldina [LPDS 2013-07, LPDR 2015-01]
- EU IP SIQS
- SFB FoQuS (FWF Project) [F4016-N23]
- ERC synergy grant UQUAM
- Division Of Physics
- Direct For Mathematical & Physical Scien [1430094] Funding Source: National Science Foundation
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When a system thermalizes it loses all memory of its initial conditions. Even within a closed quantum system, subsystems usually thermalize using the rest of the system as a heat bath. Exceptions to quantum thermalization have been observed, but typically require inherent symmetries(1,2) or noninteracting particles in the presence of static disorder(3-6). However, for strong interactions and high excitation energy there are cases, known as many-body localization (MBL), where disordered quantum systems can fail to thermalize(7-10). We experimentally generate MBL states by applying an Ising Hamiltonian with long-range interactions and programmable random disorder to ten spins initialized far from equilibrium. Using experimental and numerical methods we observe the essential signatures of MBL: initial-state memory retention, Poissonian distributed energy level spacings, and evidence of long-time entanglement growth. Our platform can be scaled to more spins, where a detailed modelling of MBL becomes impossible.
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