Squeezing of a nanomechanical resonator by quantum nondemolition measurement and feedback

被引：96

作者：

Ruskov, R ^{[1
]}

Schwab, K ^{[1
]}

Korotkov, AN ^{[1
]}

机构：

[1] Univ Calif Riverside, Dept Elect Engn, Riverside, CA 92521 USA

来源：

PHYSICAL REVIEW B | 2005年 / 71卷 / 23期

关键词：

D O I：

10.1103/PhysRevB.71.235407

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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 wave packet center due to measurement back-action. Verification of the squeezed state can be performed in almost the same way as its preparation; a similar procedure can also be used for the force detection with sensitivity beyond the standard quantum limit.

引用

页数：19

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