The production of pairs of entangled photons simply by focusing a laser beam onto a crystal
with a nonlinear optical response was used to test quantum mechanics and to open new …

Two processes of photon-pair creation can be arranged such that the paths of the emitted
photons are identical. The path information is thereby not erased but rather never born in the …

Owing to its capacity for unique (bio)-chemical specificity, microscopy with mid–infrared (IR)
illumination holds tremendous promise for a wide range of biomedical and industrial …

ABSTRACT A new type of quantum interferometer was recently realized that employs
parametric amplifiers (PAs) as the wave splitting and mixing elements. The quantum …

Entanglement is a quintessential quantum mechanical phenomenon with no classical
equivalent. First discussed by Einstein, Podolsky, and Rosen and formally introduced by …

We present a tutorial on the phenomenon of induced coherence without induced emission,
and specifically its application to imaging and metrology. It is based on a striking effect …

We show a surprising link between experimental setups to realize high-dimensional
multipartite quantum states and graph theory. In these setups, the paths of photons are …

Imaging and microscopy are some of the most important tools in modern life science for
getting new insights into metabolisms or unravelling bio‐chemical processes. However, in …

We model spontaneous parametric down-conversion (SPDC) as classical difference
frequency generation (DFG) of the pump field and a hypothetical stochastic “vacuum” seed …

Optical nonlinear conversion processes are ubiquitously applied to scientific as well as
industrial tasks. In particular, nonlinear processes are employed to generate radiation in …