title: Concurrence and fidelity of a Bose-Fermi mixture in a one-dimensional optical lattice.
abstract: We study the ground-state fidelity and entanglement of a Bose-Fermi mixture loaded in a one-dimensional optical lattice. It is found that the fidelity is able to signal quantum phase transitions between the Luttinger liquid phase, the density-wave phase, and the phase separation state of the system, and the concurrence, as a measure of the entanglement, can be used to signal the transition between the density-wave phase and the Ising phase.
authors.affiliation: Department of Physics, Fudan University, Shanghai 200433, People's Republic of China. Department of Physics and Institute of Theoretical Physics, The Chinese University of Hong Kong, Shatin, Hong Kong, People's Republic of China.
authors.forename: Wen-Qiang
authors.initials: WQ
authors.lastname: Ning
authors.forename: Shi-Jian
authors.initials: SJ
authors.lastname: Gu
authors.forename: Yu-Guang
authors.initials: YG
authors.lastname: Chen
authors.forename: Chang-Qin
authors.initials: CQ
authors.lastname: Wu
authors.forename: Hai-Qing
authors.initials: HQ
authors.lastname: Lin