Southwest Quantum Information and Technology

Robust preparation of many-body states in Jaynes-Cummings Lattices

Presenting Author: Prabin Parajuli, University of California, Merced
Contributing Author(s): Kang Cai, Gui Lu Long, C. W. Wong, and Lin Tian

Strongly-correlated polaritons in Jaynes-Cummings (JC) lattices at integer fillings can exhibit novel quantum phase transitions. However, it is often challenging to prepare such many-body ground states near the quantum critical points where the energy gap vanishes. Here we study the robust preparation of the many-body ground states of polaritons in a finite-sized JC lattice by combining the techniques of quantum state engineering and adiabatic evolution. In the deep Mott-insulating or deep superfluid regimes, the many-body ground states can be generated with high fidelity via quantum-engineered pulse sequences. Using these states as the initial state and tuning the system parameters adiabatically, the many-body ground states in the intermediate regime can be reached. We employ a nonlinear ramping scheme during the adiabatic evolution and find the optimal nonlinear index for achieving high fidelity. This study provides insights into the preparation of many-body states in artificial quantum systems, such as quantum simulators.

(Session : from 5:00pm - 7:00pm)