Secure communication is crucial in the Internet Age, and quantum mechanics stands poised
to revolutionize cryptography as we know it today. In this Review, we introduce the …

Photonic quantum technologies promise a revolution of the world of information processing,
from simulation and computing to communication and sensing, thanks to the many …

This book explains physical principles, unique benefits, broad categories, implementation
aspects, and performance criteria of distributed optical fiber sensors (DOFS). For each kind …

Single-photon detectors (SPDs) are the most sensitive instruments for light detection. In the
near-infrared range, SPDs based on III–V compound semiconductor avalanche photodiodes …

Communication security has to evolve to a higher plane in the face of the threat from the
massive computing power of the emerging quantum computers. Quantum secure direct …

A quantum key distribution (QKD) system may be probed by an eavesdropper Eve by
sending in bright light from the quantum channel and analyzing the backreflections. We …

We present a fully integrated InGaAs/InP negative feedback avalanche diode (NFAD) based
free-running single-photon detector (SPD) designed for accurate lidar applications. A free …

Single-photon avalanche diode (SPAD) exploitation in high-flux applications is often
hindered by the trade-off between the SPAD dead-time and afterpulsing probability. In this …

We report on a gated single-photon detector based on InGaAs/InP avalanche photodiodes
(APDs) with a single-photon detection efficiency exceeding 55% at 1550nm. Our detector is …

Nowadays quantum key distribution (QKD) represents the most mature quantum technology,
and multiple countries as well as private institutions are building their quantum network …