Description
My poster will present a cavity QED experiment where we use $^6$Li atoms to perform quantum simulations of random spin models.
The atom-cavity system realizes a spin chain with random transition frequencies coupled to an extended photon mode, with controlled disorder realized by a local light-shift of the excited state of the atoms. We study the competition between the collective many-body physics and the disorder in two regimes: in the near-resonant regime, N spins with random energies are coupled to a bosonic mode [1]. In the dispersive regime, one can adiabatically eliminate the cavity to obtain long-range spin-exchange interactions [2]. The effective Hamiltonian can be rewritten in terms of N spins precessing around an external magnetic field with random inhomogeneities. We measure the magnetic susceptibility of the system as a function of the disorder strength and observe the fragmentation of the collective Dicke excitations into semi-localized grey states.
As an outlook, my poster will discuss possible perspectives on using cavity-mediated interaction in combination with our light-shifting technique for the quantum simulation of holographic matter such as SYK-type models [3].
[1] Dubail, Jérôme, et al. "Large random arrowhead matrices: Multifractality, semilocalization, and protected transport in disordered quantum spins coupled to a cavity." Physical Review A 105.2 (2022): 023714.
[2] Muniz, Juan A., et al. "Exploring dynamical phase transitions with cold atoms in an optical cavity." Nature 580.7805 (2020): 602-607.
[3] Trunin, Dmitrii Alekseevich. "Pedagogical introduction to the Sachdev-Ye-Kitaev model and two-dimensional dilaton gravity." Physics-Uspekhi 64.3 (2021): 219.
| Presenter name | Nick Sauerwein |
|---|---|
| How will you attend ICAP-27? | I am planning on in-person attendance |
