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Bulletin of the American Physical Society

Protocols for a quantum network based on single photons

Susanne Blum, Christopher O’Brien, Daniel M. Reich, Nikolai Lauk, Christiane P. Koch, Michael Fleischhauer, Giovanna Morigi

Published Mar 4, 2015• 0 citations
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A single-photon maximally entangled state is obtained when a photon impinges on a balanced beamsplitter.Its nonlocal properties have been intensively debated in the quantum optics and foundations communities.It is however clear that a standard Bell test made only of passive optical elements cannot reveal the nonlocality of this state.We show that the nonlocality of single-photon entangled states can nevertheless be revealed in a quantum network made only of beamsplitters and photodetectors.In our protocol, three single-photon entangled states are distributed in a triangle network, introducing indeterminacy in the photons' paths and creating nonlocal correlations without the need for measurements choices.We discuss a concrete experimental realization and provide numerical evidence of the tolerance of our protocol to standard noise sources.Our results show that single-photon entanglement may constitute a promising solution to generate genuine network-nonlocal correlations useful for Bell-based quantum information protocols.
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