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Single-photon quantum contextuality on a chip

Crespi, Andrea, Bentivegna, Marco, Pitsios, Ioannis, Rusca, Davide, Poderini, Davide, Carvacho, Gonzalo, D'Ambrosio, Vincenzo, Cabello, Adán, Sciarrino, Fabio and Osellame, Roberto 2017. Single-photon quantum contextuality on a chip. ACS Photonics 4 (11) , pp. 2807-2812. 10.1021/acsphotonics.7b00793

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In classical physics, properties of objects exist independently of the context, i.e., whether and how measurements are performed. Quantum physics showed this assumption to be wrong, and that Nature is indeed “contextual”. Contextuality has been observed in the simplest physical systems, such as single particles, and plays fundamental roles in quantum computation advantage. Here, we demonstrate for the first time quantum contextuality in an integrated photonic chip. The chip implements different combinations of measurements on a single photon delocalized on four distinct spatial modes, showing violations of a Clauser–Horne–Shimony–Holt (CHSH)-like noncontextuality inequality. This paves the way to compact and portable devices for contextuality-based quantum-powered protocols

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Publisher: American Chemical Society
ISSN: 2330-4022
Last Modified: 23 Jan 2020 04:20

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