Nonlinear optics has been a very dynamic field of research with spectacular phenomena
discovered mainly after the invention of lasers. The combination of high intensity fields with …

Narrowband single photons that couple well to atomic ensembles could prove essential for
future quantum networks, but the efficient generation of such photons remains an …

We report a polarization-entangled photon-pair source obtained via spontaneous four-wave
mixing (SFWM) in a Doppler-broadened atomic ensemble of R 87 b atoms using a Sagnac …

We systematically studied the relation between the conditional auto-correlation function
(CACF) and cross-correlation function (CCF) of biphotons or pairs of single photons. The …

We experimentally demonstrate two-photon interference of a time-energy entangled photon
pair generated via collective two-photon coherence in Doppler-broadened cascade-type Rb …

Biphotons, generated from a hot atomic vapor via the process of spontaneous four-wave
mixing (SFWM), have the following merits: Stable and tunable frequencies as well as …

We report the generation of biphotons, with a temporal full width at the half maximum
(FWHM) of 13.4±0.3 µs and a spectral FWHM of 50±1 kHz, via the process of spontaneous …

We utilized the all-copropagating scheme, which maintains the phase-match condition, in
the spontaneous four-wave mixing (SFWM) process to generate biphotons from a hot atomic …

We demonstrate an ultrabright, narrow-band and frequency-tunable photon-pair source
based on cavity-enhanced spontaneous parametric down conversion (SPDC) which is …

Heralded single-photon sources with on-demand readout are a key enabling technology for
distributed photonic networks. Such sources have been demonstrated in both cryogenic …