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The quantum optical Josephson interferometer
Dario Gerace, Hakan E. Tureci, A. Imamoglu +2
The interplay between coherent tunnel coupling and on-site interactions in dissipation-free bosonic systems has lead to many spectacular observations, ranging from the demonstratio…
Critical exponents of one-dimensional quantum critical models by means of MERA tensor network
S. Montangero, M. Rizzi, V. Giovannetti +1
An algorithm for optimizing the MERA tensor network in an infinite system is presented. Using this technique we compute the critical exponents of Ising and XXZ model.
Quantum Illumination with Gaussian States
Si-Hui Tan, Baris I. Erkmen, Vittorio Giovannetti +5
An optical transmitter irradiates a target region containing a bright thermal-noise bath in which a low-reflectivity object might be embedded. The light received from this region i…
Communication Through a Quantum Link
Vittorio Giovannetti, Daniel Burgarth, Stefano Mancini
A chain of interacting spin behaves like a quantum mediator (quantum link) which allows two distant parties that control the ends of the chain to exchange quantum messages. We show…
Quantum Private Queries: security analysis
Vittorio Giovannetti, Seth Lloyd, Lorenzo Maccone
We present a security analysis of the recently introduced Quantum Private Query (QPQ) protocol. It is a cheat sensitive quantum protocol to perform a private search on a classical…
Architectures for a quantum random access memory
Vittorio Giovannetti, Seth Lloyd, Lorenzo Maccone
A random access memory, or RAM, is a device that, when interrogated, returns the content of a memory location in a memory array. A quantum RAM, or qRAM, allows one to access superp…
High fidelity state transfer in binary tree spin networks
T. Tufarelli, V. Giovannetti
Quantum state propagation over binary tree configurations is studied in the context of quantum spin networks. For binary tree of order two a simple protocol is presented which allo…
Spin chain model for correlated quantum channels
Davide Rossini, Vittorio Giovannetti, Simone Montangero
We analyze the quality of the quantum information transmission along a correlated quantum channel by studying the average fidelity between input and output states and the average o…
Local controllability of quantum networks
Daniel Burgarth, Sougato Bose, Christoph Bruder +1
We give a sufficient criterion that guarantees that a many-body quantum system can be controlled by properly manipulating the (local) Hamiltonian of one of its subsystems. The meth…
Sub-Rayleigh Quantum Imaging
Vittorio Giovannetti, Seth Lloyd, Lorenzo Maccone +1
No imaging apparatus can produce perfect images: spatial resolution is limited by the Rayleigh diffraction bound that is a consequence of the imager's finite spatial extent. We sho…
Quantum MERA Channels
Vittorio Giovannetti, Simone Montangero, Rosario Fazio
Tensor networks representations of many-body quantum systems can be described in terms of quantum channels. We focus on channels associated with the Multi-scale Entanglement Renorm…
Qubit channels with small correlations
Filippo Caruso, Vittorio Giovannetti, Chiara Macchiavello +1
We introduce a class of quantum channels with correlations acting on pairs of qubits, where the correlation takes the form of a shift operator onto a maximally entangled state. We…
A new approach to characterize qubit channels
Filippo Caruso, Vittorio Giovannetti
We analyze qubit channels by exploiting the possibility of representing two-level quantum systems in terms of characteristic functions. To do so, we use functions of non-commuting…