Addressable optical key distribution for unconditionally secured cryptography using phase-controlled quantum superposition

TL;DR

This paper introduces an optical key distribution protocol leveraging quantum superposition and phase control to enable unconditionally secure fiber-optic communication with addressable channels.

Contribution

It presents a novel OKD protocol compatible with classical systems, utilizing continuous phase basis for secure, addressable optical cryptography in fiber networks.

Findings

Unconditional security achieved through quantum superposition.

Protocol compatible with classical optical systems.

Network address capacity depends on noise robustness.

Abstract

Based on the detection loophole-free photon key distribution (PKD) compatible with classical optical systems, an optical key distribution (OKD) protocol is presented for unconditionally secured cryptography in fiber-optic communications networks using addressable continuous phase basis, where each communication channel is composed of paired transmission lines. The unconditional security in OKD lies in quantum superposition between the paired lines of each channel. The continuous phase basis in OKD can be applied for one-time-pad optical cryptography in networks, whose network address capacity is dependent upon the robustness of OKD to channel noises.