515 citations · 2.8k across the 30 of their papers we have counts for
6 papers · 1 filter
Gaussian Decoherence and Gaussian Echo from Spin Environments
W. H. Zurek, F. M. Cucchietti, J. P. Paz
We examine an exactly solvable model of decoherence -- a spin-system interacting with a collection of environment spins. We show that in this simple model (introduced some time ago…
Loschmidt echo in the Bose-Hubbard model: turning back time in an optical lattice
Fernando M. Cucchietti
I show how to perform a Loschmidt echo (time reversal) in the Bose-Hubbard model implemented with cold bosonic atoms in an optical lattice. The echo is obtained by applying a linea…
Universal decoherence induced by an environmental quantum phase transition
Fernando Martin Cucchietti, Sonia Fernandez-Vidal, Juan Pablo Paz
Decoherence induced by coupling a system with an environment may display universal features. Here we demostrate that when the coupling to the system drives a quantum phase transiti…
Decay of the Loschmidt echo in a time-dependent environment
Fernando M. Cucchietti, Caio H. Lewenkopf, Horacio M. Pastawski
We study the decay rate of the Loschmidt echo or fidelity in a chaotic system under a time-dependent perturbation with typical strength . The perturbation rep…
Small polarons in dilute gas Bose-Einstein condensates
Fernando M. Cucchietti, Eddy Timmermans
A neutral impurity atom immersed in a dilute Bose-Einstein condensate (BEC) can have a bound ground state in which the impurity is self-localized. In this small polaron-like state,…
Dynamics of the Bose-Hubbard model: transition from Mott insulator to superfluid
Fernando M. Cucchietti, Bogdan Damski, Jacek Dziarmaga +1
We study the dynamics of phase transitions in the one dimensional Bose-Hubbard model. To drive the system from Mott insulator to superfluid phase, we change the tunneling frequency…