Detecting quantum-coherent nanomechanical oscillations using the current-noise spectrum of a double quantum dot

Details Detecting quantum-coherent nanomechanical oscillations using the current-noise spectrum of a double quantum dot Detecting quantum-coherent nanomechanical oscillations using the current-noise spectrum of a double quantum dot

2008-08-22

arxiv.org/abs/0808.3034v2

Phys. Rev. B 78, 214302 (2008)

Physics

Quantum Physics

11 pages, 6 figures

Scientific paper

10.1103/PhysRevB.78.214302

We consider a nanomechanical resonator coupled to a double quantum dot. We demonstrate how the finite-frequency current noise spectrum through the double quantum dot can be used to distinguish classical and quantum behaviour in the nearby nano-electromechanical resonator. We also show how the full frequency current noise spectrum gives important information on the combined double quantum dot-resonator energy spectrum. Finally, we point out regimes where the quantum state of the resonator becomes squeezed, and also examine the cross-correlated electron-phonon current noise.

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