Variational Quantum Simulation of Ultrastrong Light-Matter Coupling
Agustin Di Paolo, Panagiotis Kl. Barkoutsos, Ivano Tavernelli,, Alexandre Blais
TL;DR
This paper introduces a variational quantum algorithm to simulate the ground state of quantum-optical systems in the ultrastrong-coupling regime, demonstrating proof-of-principle results on a cloud-based quantum device.
Contribution
It presents a novel short-depth variational form for preparing ground states of the multimode Dicke model on quantum hardware, advancing digital quantum simulation of complex quantum-optical systems.
Findings
Successfully prepared ground states on IBM quantum processor
Developed a method for Wigner state tomography of the ground state
Demonstrated potential for simulating models like spin-boson and Kondo
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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