Wave propagation of quantum fluctuations in quantum Ising model

P. Navez, G. Tsironis, A. Zagoskin

Published 2016-03-14Version 1

We analyze the generation process of quantum fluctuations in the quantum Ising model in order to characterize the entanglement dynamic properties between two distant qubits (spins). Starting from a strong dominant magnetic field where the spin system is in a paramagnetic regime, we switch on a spin coupling susceptible of creating correlations responsible for the ferromagnetism order. We use the large coordination expansion method to study two cases: the adiabatic switching that monitors the evolution of the ground state until it reaches the quantum transition to ordered states; a sudden sweep (quench) that monitors instead the wave behavior of the quantum fluctuations and simulate the generation of off-site correlations.