Photons have been a flagship system for studying quantum mechanics, advancing quantum
information science, and develo** quantum technologies. Quantum entanglement …

One of the biggest challenges in experimental quantum information is to sustain the fragile
superposition state of a qubit. Long lifetimes can be achieved for material qubit carriers as …

Device-independent quantum key distribution (DIQKD) is the art of using untrusted devices
to distribute secret keys in an insecure network. It thus represents the ultimate form of …

We present the realization of a highly efficient photon pair source based on spontaneous
parametric downconversion (SPDC) in a periodically poled lithium niobate (PPLN) ridge …

Efficient on-chip entangled photon pair generation at telecom wavelengths is an integral
aspect of emerging quantum optical technologies, particularly for quantum communication …

Entanglement is the key resource for many long-range quantum information tasks, including
secure communication and fundamental tests of quantum physics. These tasks require …

Long-distance optical quantum channels are necessarily lossy, leading to errors in
transmitted quantum information, entanglement degradation and, ultimately, poor protocol …

We introduce a feasible scheme to produce high-rate long-distance entanglement that uses
hybrid entanglement between continuous variables (CVs) and discrete variables (DVs). We …

Bell inequality tests where the detection efficiency is below a certain threshold $\eta_ {\rm
{crit}} $ can be simulated with local hidden-variable models. Here, we introduce a method to …

The ability to efficiently produce and manipulate nonclassical states of light is a critical
requirement for the development of quantum optical technologies. In recent years …