PT Journal AU Barreiro, JT TI Quantum physics: Environmental effects controlled SO Nature Physics JI Nat. Phys. PY 2011 BP 927–928 VL 7 DE fromIPMRAS AB An open quantum system loses its 'quantumness' when information about the state leaks into its surroundings. Researchers now show how this decoherence can be controlled between two incompatible regimes in the case of a single photon. ER