title: Squeezing of Quantum Noise of Motion in a Micromechanical Resonator.
abstract: A pair of conjugate observables, such as the quadrature amplitudes of harmonic motion, have fundamental fluctuations that are bound by the Heisenberg uncertainty relation. However, in a squeezed quantum state, fluctuations of a quantity can be reduced below the standard quantum limit, at the cost of increased fluctuations of the conjugate variable. Here we prepare a nearly macroscopic moving body, realized as a micromechanical resonator, in a squeezed quantum state. We obtain squeezing of one quadrature amplitude 1.1±0.4  dB below the standard quantum limit, thus achieving a long-standing goal of obtaining motional squeezing in a macroscopic object.
authors.affiliation: Department of Applied Physics, Aalto University, P.O. Box 11100, FI-00076 Aalto, Finland.
authors.forename: J-M
authors.initials: JM
authors.lastname: Pirkkalainen
authors.affiliation: Department of Applied Physics, Aalto University, P.O. Box 11100, FI-00076 Aalto, Finland.
authors.forename: E
authors.initials: E
authors.lastname: Damskägg
authors.affiliation: Department of Applied Physics, Aalto University, P.O. Box 11100, FI-00076 Aalto, Finland.
authors.forename: M
authors.initials: M
authors.lastname: Brandt
authors.affiliation: Department of Physics, Nanoscience Center, University of Jyväskylä, P.O. Box 35 (YFL), Jyväskylä FI-40014, Finland.
authors.forename: F
authors.initials: F
authors.lastname: Massel
authors.affiliation: Department of Applied Physics, Aalto University, P.O. Box 11100, FI-00076 Aalto, Finland.
authors.forename: M A
authors.initials: MA
authors.lastname: Sillanpää