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Quantum fluctuations of the electromagnetic vacuum impose an observablequantum limit to the lowest temperatures that can be reached with conventionallaser cooling techniques. As laser cooling experiments continue to bringmassive mechanical systems to unprecedented temperatures, this quantum limittakes on increasingly greater practical importance in the laboratory.Fortunately, vacuum fluctuations are not immutable, and can be "squeezed"through the generation of entangled photon pairs. Here we propose andexperimentally demonstrate that squeezed light can be used to sideband cool themotion of a macroscopic mechanical object below the quantum limit. To do so, wefirst cool a microwave cavity optomechanical system with a coherent state oflight to within 15% of this limit. We then cool by more than 2 dB below thequantum limit using a squeezed microwave field generated by a JosephsonParametric Amplifier (JPA). From heterodyne spectroscopy of the mechanicalsidebands, we measure a minimum thermal occupancy of 0.19 phonons. With thisnovel technique, even low frequency mechanical oscillators can in principle becooled arbitrarily close to the motional ground state, enabling the explorationof quantum physics in larger, more massive systems.

Sideband Cooling Beyond the Quantum Limit with Squeezed Light