Recent Progress in the Quantum-to-the-Home Networks

Abstract

For secure data transmission to the end users in a conventional fiber-to-the-home (FTTH) network, quantum cryptography (QC) is getting much consideration nowadays. QC or more specifically quantum key distribution (QKD) promises unconditionally secure protocol, the Holy Grail of communication and information security that is based on the fundamental laws of quantum physics. In this chapter, we discuss the design issues in a hybrid quantum-classical communication network, performance of the cost-effective offthe-shelf telecommunication equipment, our latest results on a four-state (Quadrature Phase Shift Keying, 'QPSK') RF sub-carrier assisted continuous-variable quantum key distribution (CV-QKD) multiuser network based on ultra-low loss quantum channel (pure silica core fiber, 'PSCF') and microelectromechanical systems (MEMS) based add/drop switch. The results are thoroughly compared with the commercially available high-cost encryption modules. It is expected that the discussed cost-effective and energy efficient QKD network can facilitate the practical applications of the CV-QKD protocol on the commercial scale in near future for smart access networks.

Demonstrating BB84 Quantum Key Distribution in the Physical Layer of an Optical Fiber Based System

“…Besides experimental quantum links and networks there are several concepts and objectives for QKD applications in real-life scenarios as well [31], [32], [33], [34], [35]. The accelerating tendency in the developement of QC (and technologies) has ushered in the era of the so called 'second quantum revolution.'…”