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Wisconsin Quantum Institute

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Events on Friday, April 15th, 2022

HQAN Quantum Research Colloquium
Time: 9:00 am
Place: 4274 Chamberlin
Speaker: Angela Kou (UIUC), Smitha Vishveshwara (UIUC)
Abstract: Join us for updates on the latest research from the NSF Quantum Leap Challenge Institute HQAN.
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Atoms Interlinked by Light: Programmable Interactions and Emergent Geometry
Time: 3:30 pm
Place: 2103 Chamberlin Hall
Speaker: Monika Schleier-Smith, Stanford University
Abstract: The graph of interactions in a quantum many-body system is crucial for governing the flow of information and the structure of correlations. We engineer programmable nonlocal interactions in an array of atomic ensembles within an optical resonator, where photons convey information between distant atomic spins. In our system of spin-1 atoms, the photon-mediated interactions manifest in the formation of correlated atom pairs. For all-to-all interactions, we verify the resulting entanglement by observing spin-nematic squeezing. We furthermore achieve versatile control of the graph of interactions by programming the spectrum of an optical drive field, thereby realizing effective geometries entirely distinct from the physical geometry of the array. We apply this toolbox to explore frustrated interactions, non-trivial topologies, and an emergent treelike geometry inspired by concepts of quantum gravity.
Host: Shimon Kolkowitz
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