Journal
NATURE COMMUNICATIONS
Volume 10, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s41467-019-09699-5
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Funding
- Conseil Regional d'Ile-de-France under DIM Nano-K/IFRAF
- CNRS
- Ministere de l'Enseignement Superieur et de la Recherche within CPER
- Universite Sorbonne Paris Cite (USPC)
- Indo-French Centre for the Promotion of Advanced Research -CEFIPRA [LORIC5404-1]
- NIST
- DARPA (ARO) [W911NF-16-1-0576]
- ARO [W911NF-19-1-0210]
- JILA Physics Frontier Center [NSF-PFC-1125844]
- AFOSR-MURI
- AFOSR [FA9550-18-1-0319]
- IdEx Unistra (project STEMQuS)
- NSF
- French National Research Agency as part of the Investments for the future program
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Understanding quantum thermalization through entanglement build up in isolated quantum systems addresses fundamental questions on how unitary dynamics connects to statistical physics. Spin systems made of long-range interacting atoms offer an ideal experimental platform to investigate this question. Here, we study the spin dynamics and approach towards local thermal equilibrium of a macroscopic ensemble of S = 3 chromium atoms pinned in a three dimensional optical lattice and prepared in a pure coherent spin state, under the effect of magnetic dipole-dipole interactions. Our isolated system thermalizes under its own dynamics, reaching a steady state consistent with a thermal ensemble with a temperature dictated from the system's energy. The build up of quantum correlations during the dynamics is supported by comparison with an improved numerical quantum phase-space method. Our observations are consistent with a scenario of quantum thermalization linked to the growth of entanglement entropy.
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