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11 papers · 2 filters
Quantum Shared Broadcasting
V. Giovannetti, A. S. Holevo
A generalization of quantum broadcasting protocol is presented. Here the goal is to copy an unknown input state into two subsystems which partially overlap. We show that the possib…
Quantum private queries
Vittorio Giovannetti, Seth Lloyd, Lorenzo Maccone
We propose a cheat sensitive quantum protocol to perform a private search on a classical database which is efficient in terms of communication complexity. It allows a user to retri…
Mediated Homogenization
Daniel Burgarth, Vittorio Giovannetti
Homogenization protocols model the quantum mechanical evolution of a system to a fixed state independently from its initial configuration by repeatedly coupling it with a collectio…
Quantum random access memory
Vittorio Giovannetti, Seth Lloyd, Lorenzo Maccone
A random access memory (RAM) uses n bits to randomly address N=2^n distinct memory cells. A quantum random access memory (qRAM) uses n qubits to address any quantum superposition o…
Qubit quantum channels: A characteristic function approach
Filippo Caruso, Vittorio Giovannetti
A characterization of qubit quantum channels is introduced. In analogy to what happens in the context of Bosonic channels we exploit the possibility of representing the states of t…
Robust and efficient generator of almost maximal multipartite entanglement
Davide Rossini, Giuliano Benenti
Quantum chaotic maps can efficiently generate pseudo-random states carrying almost maximal multipartite entanglement, as characterized by the probability distribution of bipartite…