A regular laser is like a choir where everyone sings their own part — the sound is loud, but with inevitable roughness. In the new quantum laser, the singers hear each other and harmonize their voices.
Crocheting, but instead of yarn you have individual molecules, and instead of a hook, a gold surface. Until now, attempts to knit such molecules into a smooth fabric ended in a tangle: the threads hooked where they shouldn't, and the pattern went awry.
A team of scientists has found a way to fix this.