By shaking the quantum vacuum, you can strike light from it. This oddity was predicted by Hendrik Casimir in 1948: two plates in a vacuum attract each other under the pressure of quantum ripples. If the plate vibrates fast enough, the ripples turn into real photons: this is the dynamic Casimir effect.
A cutting-edge optomechanical trap replicates this trick in miniature. A laser with a rapidly shifting frequency makes a tiny mirror tremble, and the emptiness around it begins spawning photon pairs. However, a surprising pattern emerges: the stronger the shake, the stingier the vacuum becomes with particles. It’s like a crowd that clenches up from a yell, choking the noise. The light comes out remarkably smooth, ‘quiet,’ almost free of random noise.
This quiet light is ideal for quantum spectroscopy — a method that identifies substances by their glow. The fingernail-sized device works without complex cooling, promising pocket-sized quantum gadgets.
In every cubic centimeter of cosmic emptiness, bubbles of energy boil and burst each second, briefly turning into electron-positron pairs.
In Frank Herbert’s epic Dune, the Holtzman effect pulls energy from space — a fiction eerily close to the real ‘mining’ of photons from the vacuum.