Physics – Quantum Physics
Scientific paper
2004-10-05
Phys. Rev. A 70, 052105 (2004)
Physics
Quantum Physics
13 pages, 2 figures
Scientific paper
10.1103/PhysRevA.70.052105
We generalize a proposal for detecting single phonon transitions in a single nanoelectromechanical system (NEMS) to include the intrinsic anharmonicity of each mechanical oscillator. In this scheme two NEMS oscillators are coupled via a term quadratic in the amplitude of oscillation for each oscillator. One NEMS oscillator is driven and strongly damped and becomes a transducer for phonon number in the other measured oscillator. We derive the conditions for this measurement scheme to be quantum limited and find a condition on the size of the anharmonicity. We also derive the relation between the phase diffusion back-action noise due to number measurement and the localization time for the measured system to enter a phonon number eigenstate. We relate both these time scales to the strength of the measured signal, which is an induced current proportional to the position of the readout oscillator.
Goan* Hsi-Sheng
Milburn Gerald J.
Roukes Michael L.
Santamore D. H.
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