title: Parametric amplification and back-action noise squeezing by a qubit-coupled nanoresonator.
abstract: We demonstrate the parametric amplification and noise squeezing of nanomechanical motion utilizing dispersive coupling to a Cooper-pair box qubit. By modulating the qubit bias and resulting mechanical resonance shift, we achieve gain of 30 dB and noise squeezing of 4 dB. This qubit-mediated effect is 3000 times more effective than that resulting from the weak nonlinearity of capacitance to a nearby electrode. This technique may be used to prepare nanomechanical squeezed states.
authors.affiliation: Condensed Matter Physics, California Institute of Technology, MC 114-36, Pasadena, California 91125, USA.
authors.forename: Junho
authors.initials: J
authors.lastname: Suh
authors.forename: Matthew D
authors.initials: MD
authors.lastname: LaHaye
authors.forename: Pierre M
authors.initials: PM
authors.lastname: Echternach
authors.forename: Keith C
authors.initials: KC
authors.lastname: Schwab
authors.forename: Michael L
authors.initials: ML
authors.lastname: Roukes