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Analysis of phase noise effects in a coupled Mach-Zehnder interferometer for a much stabilized free-space optical link.

ABSTRACT: Recently, new physics for unconditional security in a classical key distribution (USCKD) has been proposed and demonstrated in a frame of a double Mach-Zehnder interferometer (MZI) as a proof of principle, where the unconditional security is rooted in MZI channel superposition. Due to environmental phase noise caused by temperature variations, atmospheric turbulences, and mechanical vibrations, free-space optical links have been severely challenged for both classical and quantum communications. Here, the double MZI scheme of USCKD is analyzed for greatly subdued environment-caused phase noise via double unitary transformation, resulting in potential applications of free-space optical links, where the free-space optical link has been a major research area from fundamental physics of atomic clock and quantum key distribution to potential applications of geodesy, navigation, and MIMO technologies in mobile communications systems.

SUBMITTER: Ham BS

PROVIDER: S-EPMC7820431 | biostudies-literature | 2021 Jan

REPOSITORIES: biostudies-literature

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Analysis of phase noise effects in a coupled Mach-Zehnder interferometer for a much stabilized free-space optical link.

Ham Byoung S BS

Scientific reports 20210121 1

Recently, new physics for unconditional security in a classical key distribution (USCKD) has been proposed and demonstrated in a frame of a double Mach-Zehnder interferometer (MZI) as a proof of principle, where the unconditional security is rooted in MZI channel superposition. Due to environmental phase noise caused by temperature variations, atmospheric turbulences, and mechanical vibrations, free-space optical links have been severely challenged for both classical and quantum communications. ...[more]

PMID: 33479354

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