Session A33: Focus Session: Quantum-Limited Measurements

8:00 AM–10:24 AM, Monday, March 5, 2007
Colorado Convention Center Room: 403

Sponsoring Units: GQI DAMOP
Chair: Matthew Leifer, University of Waterloo / Perimeter Institute

Abstract ID: BAPS.2007.MAR.A33.4

Abstract: A33.00004 : Evidence of Dispersive Coupling between a Nanomechanical Resonator and a Cooper-Pair Box

9:00 AM–9:12 AM

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  Matthew LaHaye
    (California Institute of Technology)

  Junho Suh
    (California Institute of Technology)

  Pierre Echternach
    (Jet Propulsion Laboratory, California Institute of Technology)

  Keith Schwab
    (Cornell University)

  Michael Roukes
    (California Institute of Technology)

Many proposals have been put forth to prepare and observe quantum nano-electromechanical systems (quantum NEMS or QEMS) via coupling to a Cooper-pair box (CPB). A natural first step in the realization of these proposals is to study the dispersive interaction between a NEMS and CPB. In the dispersive limit, the coupling between the NEMS and CPB is a second-order effect that should result in a CPB-state-dependent renormalization of the nanoresonator's frequency. For typical parameters, the relative magnitude of the frequency shift should be a few ppm, resolvable with current NEMS detection capabilities. In fact, using a capacitive nanomechanical transduction scheme, we have been able to observe a red-shift of approximately 150 Hz in the frequency of a 61 MHz silicon nitride nanoresonator while tuning the ground state of a nearby CPB through a charge-degeneracy point. In my talk, I will present our most recent data and discuss the implications for the development of QEMS.

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