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The fidelity and entanglement entropy in an antiferromagnetic-ferromagneticalternating Heisenberg chain are investigated by using the method ofdensity-matrix renormalization-group. The effect of anisotropy on fidelity andentanglement entropy are investigated. The relations between fidelity,entanglement entropy and quantum phase transition are analyzed. It is foundthat the quantum phase transition point can be well characterized by both theground-state entropy and fidelity for large system.

the european physical journal. d, atomic, molecular and optical physics/the european physical journal. d, atomic, molecular, optical and plasma physics

Entanglement, fidelity, and quantum phase transition in antiferromagnetic-ferromagnetic alternating Heisenberg chain