Scientists just proved a fundamental quantum rule for the first time

Scientists experimentally confirmed that orbital angular momentum (OAM) is conserved when a single photon splits into a pair, validating a fundamental quantum physics principle. The Tampere University team proved that when a photon with zero OAM splits, the resulting photons have equal but opposite OAM values summing to zero. Despite the challenge of measuring this effect—only one in a billion photons converts to a pair—researchers developed a stable setup to confirm the conservation law. This breakthrough advances the development of complex quantum states for computing, communication, and sensing technologies.