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Decoherence induced by interacting quantum spin baths
Davide Rossini, Tommaso Calarco, Vittorio Giovannetti +2
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…
Robust optimal quantum gates for Josephson charge qubits
Simone Montangero, Tommaso Calarco, Rosario Fazio
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 leaka…
Information transfer rates in spin quantum channels
Davide Rossini, Vittorio Giovannetti, Rosario Fazio
We analyze the communication efficiency of quantum information transfer along unmodulated spin chains by computing the communication rates of various protocols. The effects of temp…
Decoherence by engineered quantum baths
Davide Rossini, Tommaso Calarco, Vittorio Giovannetti +2
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 syste…
Robustness of optimal working points for non-adiabatic holonomic quantum computation
Antonio Trullo, Paolo Facchi, Rosario Fazio +3
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…