Squeezing of a nanomechanical resonator by quantum nondemolition measurement and feedback

Details Squeezing of a nanomechanical resonator by quantum nondemolition measurement and feedback Squeezing of a nanomechanical resonator by quantum nondemolition measurement and feedback

2004-11-24

arxiv.org/abs/cond-mat/0411617v1

Phys. Rev. B 71, 235407 (2005)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

20 pages, 10 eps figures

Scientific paper

10.1103/PhysRevB.71.235407

We analyze squeezing of the nanoresonator state produced by periodic measurement of position by a quantum point contact or a single-electron transistor. The mechanism of squeezing is the stroboscopic quantum nondemolition measurement generalized to the case of continuous measurement by a weakly coupled detector. The magnitude of squeezing is calculated for the harmonic and stroboscopic modulations of measurement, taking into account detector efficiency and nanoresonator quality factor. We also analyze the operation of the quantum feedback, which prevents fluctuations of the wavepacket center due to measurement back-action. Verification of the squeezed state can be performed in almost the same way as its preparation; similar procedure can also be used for the force detection with sensitivity beyond the standard quantum limit.

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