Entanglement in a first-order quantum phase transition
J Vidal, R Mosseri, J Dukelsky - Physical Review A—Atomic, Molecular, and …, 2004 - APS
J Vidal, R Mosseri, J Dukelsky
Physical Review A—Atomic, Molecular, and Optical Physics, 2004•APSWe analyze the entanglement properties of the ground state for a system of spins half
embedded in a magnetic field, mutually interacting antiferromagnetically. Contrary to the
ferromagnetic case where a second-order quantum phase transition occurs, a first-order
transition is obtained at zero field and the so-called concurrence which measures the two-
spin entanglement displays a jump at the transition point.
embedded in a magnetic field, mutually interacting antiferromagnetically. Contrary to the
ferromagnetic case where a second-order quantum phase transition occurs, a first-order
transition is obtained at zero field and the so-called concurrence which measures the two-
spin entanglement displays a jump at the transition point.
We analyze the entanglement properties of the ground state for a system of spins half embedded in a magnetic field, mutually interacting antiferromagnetically. Contrary to the ferromagnetic case where a second-order quantum phase transition occurs, a first-order transition is obtained at zero field and the so-called concurrence which measures the two-spin entanglement displays a jump at the transition point.
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