Implementation of a hybrid scheme for coherent plug-and-play quantum key distribution |
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Authors: | Ignacio H López Grande Miguel A Larotonda |
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Affiliation: | 1.DEILAP, CITEDEF-CONICET,Villa Martelli,Argentina;2.Departamento de Física, FCEyN, UBA,Ciudad Universitaria,Buenos Aires,Argentina;3.UNIDEF, CONICET,Buenos Aires,Argentina |
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Abstract: | We experimentally demonstrate a hybrid configuration for quantum key distribution that combines the simplicity of distributed-phase-reference protocols with the self-referencing features and polarization insensitivity of the so-called plug-and-play system. Additionally, all the components are arranged in a server–client scheme to allow for practical key distribution. Blank, coherent pulse pair trains are generated at the reception end of the link by means of a pulse sequence and an unbalanced interferometer and sent to the other end. The emitter writes the qubits by erasing one of the pulses from the pair as in a coherent one-way protocol. Detection, as well as eavesdropping monitoring, is performed at the receiver side, using the same interferometer that was used to generate the initial phase-referenced pulses. |
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