Ion-trap simulation of the quantum phase transition in an exactly solvable model of spins coupled to bosons

TL;DR

This paper demonstrates how a trapped ion system can simulate an exactly solvable spin-boson model, revealing a quantum phase transition characterized by bosonic excitations and spin magnetization, with potential for experimental detection.

Contribution

It introduces an exactly solvable spin-boson model for ion traps and analyzes its quantum phase transition and ground state properties.

Findings

Quantum phase transition occurs at a critical spin-boson coupling.

Bosonic excitations serve as an order parameter for the transition.

Finite temperature phase diagram is provided.

Abstract

It is known that arrays of trapped ions can be used to efficiently simulate a variety of many-body quantum systems. Here, we show how it is possible to build a model representing a spin chain interacting with bosons which is exactly solvable. The exact spectrum of the model at zero temperature and the ground state properties are studied. We show that a quantum phase transition occurs when the coupling between spins and bosons reaches a critical value, which corresponds to a level crossing in the energy spectrum. Once the critical point is reached, the number of bosonic excitations in the ground state, which can be assumed as an order parameter, starts to be different from zero. The population of the bosonic mode is accompanied by a macroscopic magnetization of the spins. This double effect could represent an useful resource for the phase transition detection since a measure on the phonon can give information about the phase of the spin system. A finite temperature phase diagram is also given in the adiabatic regime.