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Upcoming Events

Hyosub Kim (KAIST, South Korea)
Reconfigurable single-atom array for Rydberg atom quantum simulation
Wednesday, May 23, 2018
3:30 pm - 4:30 pm
Location: PAB 232
Recently realized single-atom array synthesizers have drawn much attention on the field of atomic physics regarding quantum simulation because defect-free single-atom array suitable for spin-lattice simulation would be quickly formed [1]. Subsequently, their capacities as Rydberg quantum simulators have been demonstrated as well [2]. In this talk, I will introduce mainly my results on the array synthesizer and proof-of-principle quantum simulation thereof.
In the first part, I will report on how defect-free single-atom array could be prepared by using a liquid-crystal spatial light modulator. Further performance improvement for speed, scale, and dimension will be discussed as well.
In the second part, an experimental result on thermalization dynamics of Ising-like spin-1/2 chain will be presented. The defect-free linear or zig-zag chains of up to N=25 atoms were formed for the experiment. Then, we suddenly quenched 480 nm and 780 nm lasers for two-photon Rydberg excitation. The Rydberg fraction showed dynamics toward an equilibrium that was predicted by a thermalization theory. Also, the microscopic principle of the thermalization (detailed balance between spin-flip) was observed. It is worth to note that this thermalization scenario is a natural consequence of mere Schroedinger equation, rather than a result of an assumption such as connection to a thermal bath. Also, I will discuss the eigenstate thermalization hypothesis in this system.

[1] H. Kim, et al., "In situ single-atom array synthesis using dynamic holographic optical tweezers," Nature Communications 7, 13317 (2016);
M. Endres, et al., "Atom-by-atom assembly of defect-free one-dimensional cold atom arrays," Science 354, 1024-1027 (2016); D. Barredo, et al., "An atom-by-atom assembler of defect-free arbitrary two-dimensional atomic arrays," Science 354, 1021-1023 (2016).
[2] H. Kim, et al., "Detailed Balance of Thermalization dynamics in Rydberg atom quantum simulators,"
Physical Review Letters 120, 180502 (2018);
H. Bernien, et al., "Probing many-body dynamics on a 51-atom quantum simulator," Nature 551, 579 (2017);
V. Lienhard, et al., "Observing the space- and time-dependent growth of correlations in dynamically tuned
synthetic Ising antiferromagnets," arXiv:1711.01185 (2017).
Manuel Endres (Caltech)
Monday, June 4, 2018
4:00 pm - 5:00 pm
Location: Spilker 232

Full calendar