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.
Suh
Junho
J
Condensed Matter Physics, California Institute of Technology, MC 114-36, Pasadena, California 91125, USA.
LaHaye
Matthew D
MD
Echternach
Pierre M
PM
Schwab
Keith C
KC
Roukes
Michael L
ML