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Published October 2010 | Supplemental Material
Journal Article Open

Parametric Amplification and Back-Action Noise Squeezing by a Qubit-Coupled Nanoresonator


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.

Additional Information

© 2010 American Chemical Society. Received for review: 05/25/2010. Published on Web: 09/15/2010. The authors thank to M. Cross, R. Lifshitz and R. Karabalin for discussions and R. E. Muller for electron beam lithography. This research was partially carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration.

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