330 citations · 2.1k across the 52 of their papers we have counts for
4 papers · 1 filter
Optimal quantum estimation in spin systems at criticality
Carmen Invernizzi, Michael Korbman, Lorenzo Campos Venuti +1
It is a general fact that the coupling constant of an interacting many-body Hamiltonian do not correspond to any observable and one has to infer its value by an indirect measuremen…
Universal sub-leading terms in ground state fidelity
Lorenzo Campos Venuti, Hubert Saleur, Paolo Zanardi
The study of the (logarithm of the) {\em fidelity} i.e., of the overlap amplitude, between ground states of Hamiltonians corresponding to different coupling constants, provides a v…
Rapidly-converging methods for the location of quantum critical points from finite-size data
M. Roncaglia, L. Campos Venuti, C. Degli Esposti Boschi
We analyze in detail, beyond the usual scaling hypothesis, the finite-size convergence of static quantities toward the thermodynamic limit. In this way we are able to obtain sequen…
The fidelity approach to the Hubbard model
L. Campos Venuti, M. Cozzini, P. Buonsante +3
We use the fidelity approach to quantum critical points to study the zero temperature phase diagram of the one-dimensional Hubbard model. Using a variety of analytical and numerica…