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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…
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…
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…
The Generalized Lyapunov Theorem and its Application to Quantum Channels
Daniel Burgarth, Vittorio Giovannetti
We give a simple and physically intuitive necessary and sufficient condition for a map acting on a compact metric space to be mixing (i.e. infinitely many applications of the map t…
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…
Interferometric tunability of the absorption
Vittorio Giovannetti, Seth Lloyd, Lorenzo Maccone
We propose an interferometric setup that permits to tune the quantity of radiation absorbed by an object illuminated by a fixed light source. The method can be used to selectively…
Degradability of Bosonic Gaussian channels
Filippo Caruso, Vittorio Giovannetti
The notion of weak-degradability of quantum channels is introduced by generalizing the degradability definition given by Devetak and Shor. Exploiting the unitary equivalence with b…