Unconditionally secured classical cryptography using quantum superposition and unitary transformation.

Scientific Reports
Byoung S Ham

Abstract

Over decades quantum cryptography has been intensively studied for unconditionally secured key distribution in a quantum regime. Due to the quantum loopholes caused by imperfect single photon detectors and/or lossy quantum channels, however, the quantum cryptography is practically inefficient and even vulnerable to eavesdropping. Here, a method of unconditionally secured key distribution potentially compatible with current fiber-optic communications networks is proposed in a classical regime for high-speed optical backbone networks. The unconditional security is due to the quantum superposition-caused measurement indistinguishability between paired transmission channels and its unitary transformation resulting in deterministic randomness corresponding to the no-cloning theorem in a quantum key distribution protocol.

References

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Aug 22, 2017·Nature·Sheng-Kai LiaoJian-Wei Pan
Jul 18, 2018·Scientific Reports·Byoung S Ham
Sep 7, 2018·Optics Express·Peter J WinzerAndrew R Chraplyvy

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