Phys.org May 18, 2018
A team of international researchers (Austria, Australia, Czech Republic) compared the photon interference produced by entangled and non-entangled barium atoms. The measured difference of the interference fringes directly corresponds to the amount of entanglement in the atoms which helps to characterize the entanglement fully optically. They demonstrated that the interference signal is highly sensitive to environmental factors at the location of the atoms. The demonstration could lead to the development of highly sensitive optical gradiometers for the precise measurement of the gravitational field or the Earth’s magnetic field… read more. TECHNICAL ARTICLE
Physicists compared the photon interference produced by entangled and non-entangled barium atoms. Credit: IQOQI Innsbruck/Harald Ritsch