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

Byoung S. Ham
2021 Scientific Reports  
AbstractRecently, 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
more » ... 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.
doi:10.1038/s41598-021-81522-y pmid:33479354 fatcat:iuhbu3xfrzcgpcusvmdojetjku