Variational Quantum Simulation of Ultrastrong Light-Matter Coupling

Understand

We propose the simulation of quantum-optical systems in the ultrastrong-coupling regime using a variational quantum algorithm.

• More precisely, we introduce a short-depth variational form to prepare the groundstate of the multimode Dicke model on a quantum processor and present proof-of-principle results obtained via cloud access to an IBM device.
• We moreover provide an algorithm for characterizing the groundstate by Wigner state tomography.
• Our work is a first step towards digital quantum simulation of quantum-optical systems with potential applications to the spin-boson, Kondo and Jahn-Teller models.