Session P26: Superconducting Qubits: Materials / Nanomechanical Resonators

8:00 AM–11:00 AM, Wednesday, March 17, 2010
Room: D136

Sponsoring Unit: GQI
Chair: David Schuster, Yale University

Abstract ID: BAPS.2010.MAR.P26.15

Abstract: P26.00015 : A macroscopic mechanical resonator operated in the quantum limit

10:48 AM–11:00 AM

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  Aaron O'Connell
    (University of California, Santa Barbara - Physics)

  Radoslaw Bialczak
  Michael Lenander
  Erik Lucero
  Matteo Mariantoni
  Matthew Neeley
  Daniel Sank
  Haohua Wang
  Martin Weides
  James Wenner
  Tsuyoshi Yamamoto
  Yi Yin
  John Martinis
  Andrew Cleland

The observation of quantum effects in a macroscopic mechanical resonator is hindered by the difficulty in cooling to the quantum ground state, and in making a system that displays adequate coherence times. We are able to meet these challenges in a novel system comprising a superconducting phase qubit coupled to a high frequency (6 GHz) micromechanical dilatational resonator. Using this coupled system, we place an upper bound on the minimum average phonon occupation number of the mechanical resonator $\langle n \rangle < 0.07$, showing that the resonator is in its quantum ground state. Furthermore, we use the qubit to both create and measure a single phonon state in the resonator. Using this ability, the energy decay and phase coherence times of the resonator are extracted. Additionally, we excite the resonator directly with a classical microwave source, demonstrably creating a coherent state in the mechanical resonator.

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