Simulating the Lipkin-Meshkov-Glick model in a hybrid quantum system

TL;DR

This paper presents a scheme to simulate the Lipkin-Meshkov-Glick model using NV center ensembles coupled to superconducting cavities, enabling control of quantum phase transitions and spin squeezing.

Contribution

It introduces a practical method for simulating the LMG model in a hybrid quantum system with tunable parameters and demonstrates the generation of spin squeezed states.

Findings

Realization of various LMG models through parameter tuning.

Observation of non-equilibrium quantum phase transitions.

Generation of spin squeezed states via tailored Hamiltonian.

Abstract

We propose an efficient scheme for simulating the Lipkin-Meshkov-Glick (LMG) model with nitrogen-vacancy (NV) center ensembles in diamond magnetically coupled to superconducting coplanar waveguide cavities. With the assistance of external microwave driving fields, we show that the interaction of the NV spins can be easily controlled, and several types of the LMG model can be realized by tuning the different parameters. Under the thermal dynamical limit, the distinct non-equilibrium second order quantum phase transition of the spin ensemble can be achieved at the critical point. Furthermore, we show that the spin squeezed state can be generated by tailoring the LMG Hamiltonian to possess the two-axis counter-twisting form in this hybrid quantum system.