Measuring a weak force on a quantum scale, scientists bypassed the main noise barrier. The new method, like listening to an echo from two sides, amplifies the signal without amplifying noise. This could make gravitational wave detectors even more sensitive.
🎯 The standard quantum limit was first overcome in practice in 2013: physicists used squeezed light in the GEO600 detector, and since then the sensitivity of gravitational-wave observatories has nearly doubled.