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Carvacho G, Cariñe J, Saavedra G, et al. Postselection-Loophole-Free Bell Test Over an Installed Optical Fiber Network. Phys Rev Lett. 2015;115(3):030503doi: 10.1103/PhysRevLett.115.030503.
Carvacho, G., Cariñe, J., Saavedra, G., Cuevas, �. �., Fuenzalida, J., Toledo, F., Figueroa, M., Cabello, A., Larsson, J. �. �., Mataloni, P., Lima, G., & Xavier, G. B. (2015). Postselection-Loophole-Free Bell Test Over an Installed Optical Fiber Network. Physical review letters, 115(3), 030503. https://doi.org/10.1103/PhysRevLett.115.030503
Carvacho, Gonzalo, et al. "Postselection-Loophole-Free Bell Test Over an Installed Optical Fiber Network." Physical review letters vol. 115,3 (2015): 030503. doi: https://doi.org/10.1103/PhysRevLett.115.030503
Carvacho G, Cariñe J, Saavedra G, Cuevas Á, Fuenzalida J, Toledo F, Figueroa M, Cabello A, Larsson JÅ, Mataloni P, Lima G, Xavier GB. Postselection-Loophole-Free Bell Test Over an Installed Optical Fiber Network. Phys Rev Lett. 2015 Jul 17;115(3):030503. doi: 10.1103/PhysRevLett.115.030503. Epub 2015 Jul 14. PMID: 26230776.
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Phys Rev Lett. 2015 Jul 17;115(3):030503. doi: 10.1103/PhysRevLett.115.030503. Epub 2015 Jul 14.

Postselection-Loophole-Free Bell Test Over an Installed Optical Fiber Network.

Physical review letters

Gonzalo Carvacho, Jaime Cariñe, Gabriel Saavedra, Álvaro Cuevas, Jorge Fuenzalida, Felipe Toledo, Miguel Figueroa, Adán Cabello, Jan-Åke Larsson, Paolo Mataloni, Gustavo Lima, Guilherme B Xavier

Affiliations

  1. Departamento de Física, Universidad de Concepción, 160-C Concepción, Chile.
  2. Center for Optics and Photonics, Universidad de Concepción, Casilla 4016, Concepción, Chile.
  3. MSI-Nucleus for Advanced Optics, Universidad de Concepción, 160-C Concepción, Chile.
  4. Departamento de Ingeniería Eléctrica, Universidad de Concepción,160-C Concepción, Chile.
  5. Departamento de Física Aplicada II, Universidad de Sevilla, E-41012 Sevilla, Spain.
  6. Institutionen för Systemteknik, Linköpings Universitet, 581 83 Linköping, Sweden.
  7. Dipartimento de Fisica, Sapienza Università di Roma, Piazzale Aldo Moro 5, Roma I-00185, Italy.

PMID: 26230776 DOI: 10.1103/PhysRevLett.115.030503

Abstract

Device-independent quantum communication will require a loophole-free violation of Bell inequalities. In typical scenarios where line of sight between the communicating parties is not available, it is convenient to use energy-time entangled photons due to intrinsic robustness while propagating over optical fibers. Here we show an energy-time Clauser-Horne-Shimony-Holt Bell inequality violation with two parties separated by 3.7 km over the deployed optical fiber network belonging to the University of Concepción in Chile. Remarkably, this is the first Bell violation with spatially separated parties that is free of the postselection loophole, which affected all previous in-field long-distance energy-time experiments. Our work takes a further step towards a fiber-based loophole-free Bell test, which is highly desired for secure quantum communication due to the widespread existing telecommunication infrastructure.

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