Photonic quantum technologies represent a promising platform for several applications,
ranging from long-distance communications to the simulation of complex phenomena …

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 …

Optical quantum communication utilizing satellite platforms has the potential to extend the
reach of quantum key distribution (QKD) from terrestrial limits of∼ 200 km to global scales …

Entangled quantum particles have correlations stronger than those allowed by classical
physics. These correlations are at the heart of deep foundational questions in quantum …

The integration of Ge on Si for photonics applications has reached a high level of maturity:
Ge photodetectors are available on the Si platform in foundry processes, and Si/Ge …

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 …

Avalanche-photodiode-based near-infrared single-photon detectors have seen rapid
development in the last two decades because of their enormous internal gain, high …

Technological realities limit terrestrial quantum key distribution (QKD) to single-link
distances of a few hundred kilometers. One promising avenue for global-scale quantum …

To meet the increasing demand from quantum communications and other photon starved
applications, we have developed various InP-based single-photon detectors, including …

The design, modeling, fabrication, and characterization of single-photon avalanche diode
detectors with an epitaxial Ge absorption region grown directly on Si are presented. At 100 …