Quantum Gases2026-09-032 minarXiv:2609.03948Light Flows Without Friction: Three Ways to Measure the LimitIn a Paris laboratory, light was made to flow around an obstacle the way water flows around a rock in a stream. But this water is special: it feels no friction.T. Aladjidi·M. Baker-Rasooli·T. D. Ferreira·A. Bramati·M. Albert·Q. Glorieux·P. -É. Larré👍👎☆SimplePopularAdvanced