Quantum mechanics continues to predict effects at odds with a classical understanding of
nature. Experiments with light at the single-photon level have historically been at the …

We review the rapid recent progress in single-photon sources based on multiplexing
multiple probabilistic photon-creation events. Such multiplexing allows higher single-photon …

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

We report on the generation of an indistinguishable heralded single-photon state, using
highly nondegenerate spontaneous parametric downconversion (SPDC). Spectrally …

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 …

The ideal photon-pair source for building up multi-qubit states needs to produce
indistinguishable photons with high efficiency. Indistinguishability is crucial for minimising …

Reliable generation of single photons is of key importance for fundamental physical
experiments and to demonstrate quantum protocols. Waveguide-based photon-pair sources …

Entangled photon pair sources based on bulk optics are approaching optimal design and
implementation, with high state fidelities, spectral purities and heralding efficiencies, but …

The realization of an ultra‐fast source of heralded single photons emitted at the wavelength
of 1540 nm is reported. The presented strategy is based on state‐of‐the‐art telecom …

We report on the generation of indistinguishable photon pairs at telecom wavelengths based
on a type-II parametric down conversion process in a periodically poled potassium titanyl …