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19 papers · 2 filters
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…
Entanglement of Electrons Field-Emitted from a Superconductor
Kazuya Yuasa, Paolo Facchi, Rosario Fazio +4
Under appropriate circumstances the electrons emitted from a superconducting tip can be entangled. We analyze these nonlocal correlations by studying the coincidences of the field-…
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…
Light-matter excitations in the ultra-strong coupling regime
Aji A. Anappara, Simone De Liberato, Alessandro Tredicucci +4
In a microcavity, light-matter coupling is quantified by the vacuum Rabi frequency . When is larger than radiative and non-radiative loss rates, the system eigenstates (…