One to Many QKD Network System Using Polarization-Wavelength Division Multiplexing

Abstract

The quantum key distribution (QKD) research, which is drawing attention as the next secure communication, is actively expanding from point to point system to network architecture. In QKD network system, it is important to increase the number of users who can securely communicate. Up to date, a wavelength division multiplexing (WDM) architecture has successfully expanded the number of channels without significant system loss, but there is a limitation of increasing channels considering the range of telecommunication wavelength and crosstalk noise, etc. In this paper, we propose a polarizing division method that increases user channels independently of wavelengths. The proposed architecture can increase the number of wavelength multiplexed channels by a multiple of the polarization number. We identify the issues in the QKD network system that may occur when using polarization and wavelengths simultaneously, then provide solutions and optimize the system operation accordingly. Finally, we describe a field test result of a one to many QKD network system that shows successful key exchange with 3% QBER.

Toward Quantum Secured Distributed Energy Resources: Adoption of Post-Quantum Cryptography (PQC) and Quantum Key Distribution (QKD)

“…The price of quantum equipment is referenced in the paper [86,87]. According to the latest quantum network study, one quantum server can be connected to a maximum of four quantum transceiver nodes through a quantum channel with a data rate as 2 Kbps [88,89]. Based on Equation ( 1) and the result of the latest quantum server research, we can calculate the cost of the QKD network for DER in Figure 9.…”

“…Kbps[88,89]. Based on Equation(1) and the result of the latest quantum server research, we can calculate the cost of the QKD network for DER in Figure9.…”

EntangleNetSat: A Satellite-Based Entanglement Resupply Network

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