A new record has been set in squeezing of the quantum state of light, which could be important for improving the sensitivity of gravitational-wave detectors and for more precise calibrations of photoelectric detectors. Henning Vahlbruch of Leibniz Universität Hannover and the Max-Planck-Insitut für Gravitationsphysik and colleagues used degenerate parametric down-conversion in a doubly resonant optical parametric amplifier to reduce amplitude fluctuations by a factor of 32 (15 dB) relative to classical noise. The result was demonstrated at a wavelength of 1064 nm, which is the wavelength used in all current interferometric gravitational-wave observatories. With this squeezed light, the team was also able to measure the quantum efficiency of a customised InGaAs PIN diode with a 0.5% uncertainty.