Fully autocompensating high-dimensional quantum cryptography by optical phase conjugation

• URL: http://arxiv.org/abs/2009.13915v1
• Date: Tue, 29 Sep 2020 10:18:34 GMT
• Title: Fully autocompensating high-dimensional quantum cryptography by optical phase conjugation
• Authors: Jes\'us Li\~nares, Xes\'us Prieto-Blanco, Daniel Balado and Gabriel M. Carral
• Abstract summary: We prove that random phase shifts and couplings among 2N spatial and polarization optical modes are autocompensated after a single round trip between Alice and Bob. We generate non-perturbated 1-qudit states for high-dimensional QKD protocols, as the BB84 one of a higher security.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We present a bidirectional quantum communication system based on optical phase conjugation for achieving fully autocompensating high-dimensional quantum cryptography. We prove that random phase shifts and couplings among 2N spatial and polarization optical modes described by SU(2N) transformations due to perturbations are autocompensated after a single round trip between Alice and Bob. Bob can use a source of single photons or, alternatively, coherent states and then Alice attenuates them up to a single photon level, and thus non-perturbated 1-qudit states are generated for high-dimensional QKD protocols, as the BB84 one, of a higher security.

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