Journal
NATURE
Volume 459, Issue 7249, Pages 960-964Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/nature08093
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Funding
- US National Science Foundation [DMR-0804567]
- Foundational Questions Institute [RFP2-08-27]
- Center for the Physics of Information, California Institute of Technology
- US National Aeronautics and Space Administration
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The observation of the quantum states of motion of a macroscopic mechanical structure remains an open challenge in quantum-state preparation and measurement. One approach that has received extensive theoretical attention(1-13) is the integration of superconducting qubits as control and detection elements in nanoelectromechanical systems (NEMS). Here we report measurements of a NEMS resonator coupled to a superconducting qubit, a Cooper-pair box. We demonstrate that the coupling results in a dispersive shift of the nanomechanical frequency that is the mechanical analogue of the 'single-atom index effect'(14) experienced by electromagnetic resonators in cavity quantum electrodynamics. The large magnitude of the dispersive interaction allows us to perform NEMS-based spectroscopy of the superconducting qubit, and enables observation of Landau-Zener interference effects-a demonstration of nanomechanical read-out of quantum interference.
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