The atomic, molecular, and optical (AMO) physics community at Stanford spans the departments of Physics, Applied Physics, and Electrical Engineering.  Browse our site to learn about research groups, events, and more.

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
Abstract
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