Bell inequality violation by entangled single photon states generated from a laser, a LED or a Halogen lamp

• URL: http://arxiv.org/abs/2003.09961v3
• Date: Fri, 6 Nov 2020 10:24:33 GMT
• Title: Bell inequality violation by entangled single photon states generated from a laser, a LED or a Halogen lamp
• Authors: M. Pasini, N. Leone, S. Mazzucchi, V. Moretti, D. Pastorello, L. Pavesi
• Abstract summary: We show that single-particle entangled states of single photons can be produced from attenuated sources of light. This has important consequences, since it demonstrates that cheap, compact, and low power entangled photon sources can be used for a range of quantum technology applications.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: In single-particle or intraparticle entanglement, two degrees of freedom of a single particle, e.g., momentum and polarization of a single photon, are entangled. Single-particle entanglement (SPE) provides a source of non classical correlations which can be exploited both in quantum communication protocols and in experimental tests of noncontextuality based on the Kochen-Specker theorem. Furthermore, SPE is robust under decoherence phenomena. Here, we show that single-particle entangled states of single photons can be produced from attenuated sources of light, even classical ones. To experimentally certify the entanglement, we perform a Bell test, observing a violation of the Clauser, Horne, Shimony and Holt (CHSH) inequality. On the one hand, we show that this entanglement can be achieved even in a classical light beam, provided that first-order coherence is maintained between the degrees of freedom involved in the entanglement. On the other hand, we prove that filtered and attenuated light sources provide a flux of independent SPE photons that, from a statistical point of view, are indistinguishable from those generated by a single photon source. This has important consequences, since it demonstrates that cheap, compact, and low power entangled photon sources can be used for a range of quantum technology applications.

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