Tracking down the mystery of entangled particles of light

Bernese researchers have taken an important step towards new measurement methods such as quantum spectroscopy. In an experiment, they succeeded in uncovering part of the mystery surrounding the so-called "entangled photons" and gaining fine control on the measured correlations. Quantum technologies hold the promise to go beyond the capabilities of classical present technologies by making use of pure quantum phenomenon, such as "entangled particles". Quantum technologies are used in various applications, for example in quantum computers or in quantum sensing and metrology, which allows for imaging with higher resolution or determine more accurately properties of atoms and molecules. Entangled particles. Entanglement is one of the most impressive quantum physical phenomena. It describes the property of two particles not behaving like two independent objects, but like a single physical object.