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

Entangled photon sources are desirable and key elements for photonic quantum information
processing. The spontaneous parametric down‐conversion (SPDC) process is a convenient …

Entangled-photon sources with simultaneously near-unity heralding efficiency and
indistinguishability are the fundamental elements for scalable photonic quantum …

We report the first experimental demonstration of quantum entanglement among ten
spatially separated single photons. A near-optimal entangled photon-pair source was …

Integrated optical components on lithium niobate play a major role in standard high-speed
communication systems. Over the last two decades, after the birth and positioning of …

A global quantum repeater network involving satellite-based links is likely to have
advantages over fiber-based networks in terms of long-distance communication, since the …

We demonstrate a compactly integrated polarization beam splitter (PBS) with high
polarization extinction ratios greater than 20 dB over the full C-band wavelength range …

Photon pairs produced by parametric down-conversion or four-wave mixing can interfere
with each other in multiport interferometers or carry entanglement between distant nodes for …

Hybrid quantum networks rely on efficient interfacing of dissimilar quantum nodes, as
elements based on parametric downconversion sources, quantum dots, colour centres or …

Heralded single-photon sources (HSPS) intrinsically suffer from multiphoton emission,
leading to a trade-off between the source's single-photon quality and the heralding rate. A …