The recent rapid growth of satellite-constellation programmes for remote sensing and
communications, enabled by the availability of small-sized and low-cost satellites, has …

As the existing radio-frequency (RF) networks cannot meet the ever-increasing data rate
demand, the optical wireless communication (OWC), which uses a wide untapped …

The measurement of quantum signals that travel through long distances is fundamentally
and technologically interesting. We present quantum-limited coherent measurements of …

The free‐space optical communication is regarded as a promising technique for next
generation networks. However, all the data are exposed in free space with high risk of being …

Free-space optical communication links are promising channels for establishing secure
quantum communication. Here we study the transmission of nonclassical light through a …

The use of free-space optical (FSO) systems as secure transmission media has recently
attracted research efforts worldwide. However, their secrecy performance may be …

This paper proposes a novel design and analyzes security performance of quantum key
distribution (QKD) protocol over free-space optics (FSO). Unlike conventional QKD protocols …

Free-space optical (FSO) communication systems are a promising technology for future
smart cities due to their cost-effective installation, high data throughput, extensive reach, and …

Wireless communication technique operating at terahertz (THz) frequencies is regarded as
the most potential candidate for future wireless networks due to its wider frequency …

Quantum key distribution network has become a reality in practical environment. Quantum
repeaters have been explored in various physical systems and their combinations. For …