The biggest ‘Schrödinger’s cat’ yet — physicists put 7,000 atoms in superposition NatureProbing quantum mechanics with nanoparticle matter-wave interferometry NatureThe edge of the quantum world just moved closer to our reality New ScientistMetal clumps in a quantum state: Physicists place thousands of sodium atoms in a ‘Schrödinger’s cat state’ Phys.orgQuantum wave behavior observed in record-breaking 7,000-atom metal cluster 동아사이언스