BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Talks.cam//talks.cam.ac.uk//
X-WR-CALNAME:Talks.cam
BEGIN:VEVENT
SUMMARY:Many-body physics with arrays of individual Rydberg atoms - Prof. 
 Antoine Browaeys\, Institut d’Optique\, Laboratoire Charles Fabry
DTSTART:20190315T143000Z
DTEND:20190315T153000Z
UID:TALK117847@talks.cam.ac.uk
CONTACT:Kayleigh Dunn
DESCRIPTION:This talk will present our effort to control and use the dipol
 e-dipole interactions between cold Rydberg atoms in order to implement spi
 n Hamiltonians useful for quantum simulation of condensed matter situation
 s. In our experiment\, we trap individual atoms in arrays of optical tweez
 ers separated by few micrometers and excite them to Rydberg states using l
 asers. The arrays are produced by a spatial light modulator\, which shapes
  the dipole trap beam. We can create almost arbitrary geometries of the ar
 rays with near unit filling in two and three dimensions up to about 70 ato
 ms. We have demonstrated the coherent energy exchange in chains of Rydberg
  atoms resulting from their resonant dipole-dipole interaction and its con
 trol by addressable lasers. This interaction realizes the XY spin model. W
 e use this control to study elementary excitations in a di-merized spin ch
 ain featuring topological properties\, thus implementing the Su-Schrieffer
 -Heeger model. We have observed the edge states in the topological conditi
 on and their hybridization by studying their dynamics. We explored the reg
 ime beyond the linear response by adding several excitations\, which act a
 s hard-core bosons. Using the van der Waals interaction between atoms\, we
  have also implemented the quantum Ising model in one-dimensional chains w
 ith periodic boundary conditions and two-dimensional arrays containing up 
 to about 50 atoms. We measure the dynamics of the excitation for various s
 trengths of the interactions and compare the data to numerical simulations
  of this many-body system. This control of an ensemble of interacting Rydb
 erg atoms demonstrates an interesting platform for quantum simulation usin
 g neutral atoms\, complementary to the other platforms based on ions\, mag
 netic atoms or dipolar molecules.
LOCATION:Rayleigh and JJ Thompson Seminar room\, Maxwell Building
END:VEVENT
END:VCALENDAR