  The entanglement entropy and quantum fidelity in a hard-core-boson model with
nearest- and next-nearest-neighbor interactions are studied numerically. By
using exact diagonalization and the density matrix renormalization group, the
effects of interactions on entanglement entropy and fidelity susceptibility in
the model are investigated. We focus our attention on looking for three quantum
phase transitions. It is found that the first derivative of the entanglement
entropy can indicate all of three phase transitions, while the fidelity
susceptibility cannot predict the transition from superfluid to bond-order in a
finite-size system.
