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Updated: Jun 5, 2026

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
Published on: September 5, 2019
No signaling, entanglement breaking, and localizability in bipartite channels
Giacomo Mauro D'Ariano1, Stefano Facchini, Paolo Perinotti
1QUIT Group, Dipartimento di Fisica A. Volta, INFN Sezione di Pavia, via Bassi 6, 27100 Pavia, Italy.
Abstract:
A bipartite quantum channel represents the interaction between systems, generally allowing for the exchange of information. A special class of bipartite channels is the no-signaling ones, which do not allow for communication. Piani et al. [Phys. Rev. A 74, 012305 (2006)] conjectured that all no-signaling channels are mixtures of entanglement breaking and localizable channels, which require only local operations and entanglement. Here we provide the general realization scheme, and give a counterexample to the conjecture, achieving no-signaling superquantum correlations while preserving entanglement.
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