Phase noise-immune unconditionally secured classical key distribution using doubly coupled Mach-Zehnder interferometer
arXiv:2009.02665
Abstract
Recently, new physics for unconditional security in a classical key distribution (USCKD) in a frame of a double Mach-Zehnder interferometer has been proposed and demonstrated as a proof of principle, where the unconditional security is unaffected by the no-cloning theorem of quantum key distribution protocols. Due to environmental phase fluctuations caused by temperature variations, atmospheric turbulences, or mechanical vibrations, active phase locking seems to be necessary for the two-channel transmission layout of USCKD. Here, the two-channel layout of USCKD is demonstrated to be an environmental noise-immune protocol especially for free space optical links, where the transmission distance is potentially unlimited if random phase noises are considered.
9 pages, 3 figures
References in corpus (7)
- The Quantum Internet
- Satellite-to-ground quantum key distribution
- Hacking commercial quantum cryptography systems by tailored bright illumination
- Indistinguishable photons from separated silicon-vacancy centers in diamond
- Insecurity of detector-device-independent quantum key distribution
- Observations of coherence de Broglie waves
- Analysis of nonclasscial features in a coupled macroscopic binary system