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50 papers · 2 filters
Demonstration of a programmable source of two-photon multiqubit entangled states
Simone Cialdi, Davide Brivio, Matteo G. A. Paris
We suggest and demonstrate a novel source of two-photon multipartite entangled states which exploits the transverse spatial structure of spontaneous parametric downconversion toget…
Instantonic Methods for Quantum Tunneling in Finite Size
Marco Zoli
The instantonic approach for a model potential is reexamined in the asymptotic limit. The path integral of the system is derived in semiclassical approximation expanding the…
Long-distance entanglement in many-body atomic and optical systems
Salvatore M. Giampaolo, Fabrizio Illuminati
We discuss the phenomenon of long-distance entanglement in the ground state of quantum spin models, its use in high-fidelity and robust quantum communication, and its realization i…
Reduced density matrix of permutational invariant many-body systems
Mario Salerno, Vladislav Popkov
We consider density matrices which are sums of projectors on states spanning irreducible representations of the permutation group of L sites (eigenstates of permutational invariant…
Casimir-Polder forces between two accelerating atoms and the Unruh effect
Jamir Marino, Roberto Passante
The Casimir-Polder force between two atoms with equal uniform acceleration and separated by a constant distance R is considered. We show that, in the low-acceleration limit, while…
Information geometry of Gaussian channels
Alex Monras, Fabrizio Illuminati
We define a local Riemannian metric tensor in the manifold of Gaussian channels and the distance that it induces. We adopt an information-geometric approach and define a metric der…