Variational Quantum Simulation of Ultrastrong Light-Matter Coupling

Abstract

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.

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• Quantum-optimal-control-inspired ansatz for variational quantum algorithms
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• Quantum Information Processing with Molecular Nanomagnets: an introduction
• Compact cavity-dressed Hamiltonian framework at arbitrarily strong light-matter coupling