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Browsing by Author "Calarco, Tommaso"

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Browsing by Author "Calarco, Tommaso"

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  • Rossini, Davide; Calarco, Tommaso; Giovannetti, Vittorio; Montangero, Simone; Fazio, Rosario (2007-09-12)
    We introduce, and determine decoherence for, a wide class of non-trivial quantum spin baths which embrace Ising, XY and Heisenberg universality classes coupled to a two-level system. For the XY and Ising universality classes ...
  • Rossini, Davide; Calarco, Tommaso; Giovannetti, Vittorio; Montangero, Simone; Fazio, Rosario (2007-09-03)
    We study decoherence induced on a two-level system coupled to a one-dimensional quantum spin chain. We consider the cases where the dynamics of the chain is determined by the Ising, XY, or Heisenberg exchange Hamiltonian. ...
  • Caneva, Tommaso; Murphy, Michael; Calarco, Tommaso; Fazio, Rosario; Montangero, Simone; Giovannetti, Vittorio; Santoro, Giuseppe E. (American Physical Society, 2009-12-07)
    Optimal control theory is a promising candidate for a drastic improvement of the performance of quantum information tasks. We explore its ultimate limit in paradigmatic cases, and demonstrate that it coincides with the ...
  • Montangero, Simone; Calarco, Tommaso; Fazio, Rosario (2007-11-06)
    Quantum optimal control theory allows to design accurate quantum gates. We employ it to design high-fidelity two-bit gates for Josephson charge qubits in the presence of both leakage and noise. Our protocol considerably ...
  • Caneva, Tommaso; Calarco, Tommaso; Fazio, Rosario; Santoro, Giuseppe E.; Montangero, Simone (American Physical Society, 2011-07-12)
    The number of defects which are generated on crossing a quantum phase transition can be minimized by choosing properly designed time-dependent pulses. In this work we determine what are the ultimate limits of this optimization. ...