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11 papers · 2 filters
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…
Optimal quantum chain communication by end gates
D. Burgarth, V. Giovannetti, S. Bose
The scalability of solid state quantum computation relies on the ability of connecting the qubits to the macroscopic world. Quantum chains can be used as quantum wires to keep regi…
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…
One-mode Bosonic Gaussian channels: a full weak-degradability classification
F. Caruso, V. Giovannetti, A. S. Holevo
A complete degradability analysis of one-mode Gaussian Bosonic channels is presented. We show that apart from the class of channels which are unitarily equivalent to the channels w…
Entanglement and statistics in Hong-Ou-Mandel interferometry
Vittorio Giovannetti
Hong-Ou-Mandel interferometry allows one to detect the presence of entanglement in two-photon input states. The same result holds for two-particles input states which obey to Fermi…