TY - JOUR AU - James Thompson BT - Nature DA - 2015-03 DO - 10.1038/519420b PY - 2015 SP - 420 EP - 422 T2 - Nature TI - Quantum physics: Atomic doughnuts from single photons UR - http://www.nature.com/doifinder/10.1038/519420b VL - 519 SN - 0028-0836 ER -