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Browsing by Author "Facchi, Paolo"

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Browsing by Author "Facchi, Paolo"

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  • Bang-bang control of a qubit coupled to a quantum critical spin bath
    Rossini, Davide; Facchi, Paolo; Fazio, Rosario; Florio, Giuseppe; Lidar, Daniel A.; Pascazio, Saverio; Plastina, Francesco; Zanardi, Paolo (2008-07-04)
    We analytically and numerically study the effects of pulsed control on the decoherence of a qubit coupled to a quantum spin bath. When the environment is critical, decoherence is faster and we show that the control is ...
  • Entanglement of electrons field-emitted from a superconductor
    Yuasa, Kazuya; Facchi, Paolo; Fazio, Rosario; Nakazato, Hiromichi; Ohba, Ichiro; Pascazio, Saverio; Tasaki, Shuichi (American Physical Society, 2009-05-11)
    Under appropriate circumstances the electrons emitted from a superconducting tip can be entangled. We analyze these nonlocal correlations by studying the coincidences of the field-emitted electrons and show that electrons ...
  • Robust gates for holonomic quantum computation
    Florio, Giuseppe; Facchi, Paolo; Fazio, Rosario; Giovannetti, Vittorio; Pascazio, Saverio (2007-10-24)
    Non Abelian geometric phases are attracting increasing interest because of possible experimental application in quantum computation. We study the effects of the environment (modelled as an ensemble of harmonic oscillators) ...
  • Robustness of optimal working points for nonadiabatic holonomic quantum computation
    Trullo, Antonio; Facchi, Paolo; Fazio, Rosario; Florio, Giuseppe; Giovannetti, Vittorio; Pascazio, Saverio (2007-10-31)
    Geometric phases are an interesting resource for quantum computation, also in view of their robustness against decoherence effects. We study here the effects of the environment on a class of one-qubit holonomic gates that ...
  • Statistical mechanics of the cluster Ising model
    Smacchia, Pietro; Amico, Luigi; Facchi, Paolo; Fazio, Rosario; Florio, Giuseppe; Pascazio, Saverio; Vedral, Vlatko (American Physical Society, 2011-08-02)
    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 correlation functions and entanglement both in ...