Entangling Mechanical Motion with Microwave Fields

Optomechanically Entangled Quantum entanglement allows engineered quantum systems to exceed classical information processing bounds. Palomaki et al. (p. 710 , published online 3 October; see the Perspective by Hammerer ) extend this quantum resource into the domain of micromechanical oscillators by demonstrating entanglement between a microwave field and a mechanical oscillator. The mechanical part of the entangled state could then be transferred to a second microwave field.