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Topological order in 1D Cluster state protected by symmetry
Wonmin Son, Luigi Amico, Vlatko Vedral
We demonstrate how to construct the Z2*Z2 global symmetry which protects the ground state degeneracy of cluster states for open boundary conditions. Such a degeneracy ultimately ar…
Statistical mechanics of the Cluster-Ising model
Pietro Smacchia, Luigi Amico, Paolo Facchi +4
We study a Hamiltonian system describing a three-spin-1/2 cluster-like interaction competing with an Ising-like anti-ferromagnetic interaction. We compute free energy, spin correla…
Quantum phase transition between cluster and antiferromagnetic states
Wonmin Son, Luigi Amico, Rosario Fazio +3
We study a Hamiltonian system describing a three spin-1/2 cluster-like interaction competing with an Ising-like exchange. We show that the ground state in the cluster phase possess…