This Colloquium examines the field of the Einstein, Podolsky, and Rosen (EPR) gedanken
experiment, from the original paper of Einstein, Podolsky, and Rosen, through to modern …

We present the full experimental reconstruction of Gaussian entangled states generated by
a type-II optical parametric oscillator below threshold. Our scheme provides the entire …

Subtle quantum properties offer exciting new prospects in optical communications. For
example, quantum entanglement enables the secure exchange of cryptographic keys 1 and …

We describe continuous-variable hyperentanglement in polarization and orbital angular
momentum modes of an optical parametric oscillator. The quantum stochastic equations for …

We theoretically propose a scheme to generate a strong continuous-variable quantum
entangled light source in four-wave mixing (FWM) process by increasing the optical density …

We pump a degenerate frequency-divide-by-two optical parametric oscillator (OPO) based
on orientation-patterned GaAs with a stable Tm frequency comb at 2 micrometer wavelength …

We show theoretically and experimentally that scattered light by thermal phonons inside a
second-order nonlinear crystal is the source of additional phase noise observed in optical …

We report the first experimental observation of bright EPR beams produced by a type-II
optical parametric oscillator operating above threshold at frequency degeneracy. The …

Based on a polarized and dual-end pumping scheme and a ring resonator, a stable, high
power and high beam quality continuous-wave single-frequency Nd: YVO_4 green laser …

We experimentally investigate quadrature correlations between pump, signal, and idler
fields in an above-threshold optical parametric oscillator. We observe new quantum …