Thermally-robust spin correlations between two atoms

Pimonpan Sompet, Stuart S. Szigeti, Eyal Schwartz, Ashton S. Bradley & Mikkel F. Andersen

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Jul 30, 2018
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Received: 3rd July 18

Bottom-up assembly of few- and many-body systems from individual atoms could deliver robust entanglement, which is a key resource for quantum technologies.Furthermore, it allows quantum processes to be observed at the individual event level, revealing information concealed by ensemble-averaged measurements and providing insights into molecular processes, thermalization, and quantum thermodynamics.Here, we study the spin dynamics of a two-body system consisting of individually-assembled pairs of 85Rb atoms, whose collisional properties prevent investigation in the many-body regime.The thermal spin-2 atoms show perfect pair correlation between magnetic sublevels on timescales exceeding one second, with measured relative number fluctuations 11.9±0.3 dB below quantum shot noise (QSN), limited only by detection efficiency. Both microscopic simulations and experiments display relaxation dynamics, contrary to the coherent spin waves witnessed in finite-temperature many-body experiments and zero-temperature two-body experiments. The relative relaxation rates are consistent with theoretical predictions of the 85Rb spin-dependent interaction strengths.Our experiment is a versatile platform for studying two-body quantum dynamics and may provide a route to thermally-robust entanglement generation.

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This is an abstract of a preprint hosted on an independent third party site. It has not been peer reviewed but is currently under consideration at Nature Communications.

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