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Optimal analysis of ultra broadband energy-time entanglement for high bit-rate dense wavelength division multiplexed quantum networks

Abstract : We demonstrate an experimental method for measuring energy-time entanglement over almost 80 nm spectral bandwidth in a single shot with a quantum bit error rate below 0.5%. Our scheme is extremely cost-effective and efficient in terms of resources as it employs only one source of entangled photons and one fixed unbalanced interferometer per phase-coded analysis basis. We show that the maximum analysis spectral bandwidth is obtained when the analysis interferometers are properly unbalanced, a strategy which can be straightforwardly applied to most of today's experiments based on energy-time and time-bin entanglement. Our scheme has therefore a great potential for boosting bit rates and reducing the resource overhead of future entanglement-based quantum key distribution systems.
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https://hal.archives-ouvertes.fr/hal-01330127
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Submitted on : Friday, June 10, 2016 - 9:05:48 AM
Last modification on : Tuesday, May 26, 2020 - 6:50:51 PM

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F Kaiser, D Aktas, B Fedrici, T Lunghi, Laurent Labonté, et al.. Optimal analysis of ultra broadband energy-time entanglement for high bit-rate dense wavelength division multiplexed quantum networks. Applied Physics Letters, American Institute of Physics, 2016, 108, pp.231108. ⟨10.1063/1.4953785⟩. ⟨hal-01330127⟩

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