Parametric amplification and back-action noise squeezing by a qubit-coupled nanoresonator

Junho Suh, Matthew D. Lahaye, Pierre M. Echternach, Keith C. Schwab, Michael L. Roukes

Research output: Contribution to journalArticlepeer-review

68 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)3990-3994
Number of pages5
JournalNano Letters
Issue number10
StatePublished - Oct 13 2010


  • Cooper-pair-box qubit
  • NEMS
  • dispersive coupling
  • noise squeezing
  • parametric amplification
  • squeezed state

ASJC Scopus subject areas

  • Bioengineering
  • General Chemistry
  • General Materials Science
  • Condensed Matter Physics
  • Mechanical Engineering


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