Scientists Built a One-Way Street for Quantum Sound. No U-Turns.
Quantum physics has a long and proud tradition of producing headlines that sound like they were generated by a word randomizer set to "science fiction." This week's entry: researchers at Japan's RIKEN institute have proposed a method to make quantum systems synchronize in only one direction — essentially a one-way street for phonons, the quantum mechanical particles associated with sound. No turns. No going back. The universe has filed the relevant paperwork.