Quantum Squeezing of Molecules Improves Sensor Accuracy Threefold express
Any measuring device is spoiled by quantum noise — the chaotic jitters of elementary particles. To tame it, physicists used a trick on calcium fluoride molecules, much like squeezing a balloon: press in one spot, and it bulges in another. The idea is the same: quantum uncertainty is driven into a parameter that doesn't matter for the measurement, while the quantity of interest becomes three times more precise.
The molecules were held in traps made of laser light, made to spin in unison like tiny tops. Using laser pulses and clever light control, scientists built up their entanglement — the very phenomenon Einstein called 'spooky'. Remarkably, the squeezed state was written onto the molecule's internal rotation, where it lasted 100 milliseconds. It's like putting a quantum 'secret' into a safe. Now such molecular sensors can search for dark matter, test laws beyond known physics, and pick up gravitational waves.
Until now, quantum squeezing had only been achieved with single atoms or ions; molecules, much more complex objects, have been used for the first time.