Erlangen 2018 – wissenschaftliches Programm

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SYPS: PhD-Symposium

SYPS 1: PhD-Symposium: Floquet Physics - how time-periodic systems can make a difference

SYPS 1.4: Hauptvortrag

Montag, 5. März 2018, 15:30–16:00, RW HS

Floquet Discrete Time Crystals in a Trapped-Ion Quantum Simulator — •Guido Pagano¹, Jiehang Zhang¹, Paul Hess¹, Antonis Kyprianidis¹, Patrick Becker¹, Jacob Smith¹, Aaron Lee¹, Norman Yao², Tobias Grass¹, Alessio Celi³, Maciej Lewenstein³, and Christopher Monroe¹ — ¹Joint Quantum Institute, University of Maryland Department of Physics and National Institute of Standards and Technology, College Park, Maryland 20742 — ²Department of Physics, University of California Berkeley, Berkeley, CA 94720, USA — ³ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, 08860 Castelldefels, Spain

Linear arrays of trapped and laser cooled atomic ions (¹⁷¹Yb⁺) are a versatile platform for studying strongly correlated many-body quantum systems with long range interactions. By off-resonantly driving motional normal modes with spin-dependent optical dipole forces, we generate tunable long-range spin-spin interactions, which are largely insensitive to the number of ions in the trap. We achieve a higher degree of control with a tightly-focused laser beam imparting a unique light shift on each ion, which we use for state initialization or to introduce controlled disorder into the system. Using these techniques in a Floquet setting allows us to observe time-crystalline phases, where the spin system exhibits persistent time-correlations either under Many-body-localized dynamics or in a prethermal regime. Moreover Floquet engineering in trapped-ion simulators can be also used to study topological systems by realizing complex-valued spin-spin interactions.