Quantum-Limited Position Detection and Amplification: A Linear Response Perspective

Details Quantum-Limited Position Detection and Amplification: A Linear Response Perspective Quantum-Limited Position Detection and Amplification: A Linear Response Perspective

2004-06-23

arxiv.org/abs/cond-mat/0406536v2

Phys. Rev. B 70, 245306 (2004)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

9 pages; minor typos corrected

Scientific paper

10.1103/PhysRevB.70.245306

Using standard linear response relations, we derive the quantum limit on the sensitivity of a generic linear-response position detector, and the noise temperature of a generic linear amplifier. Particular emphasis is placed on the detector's effective temperature and damping effects; the former quantity directly determines the dimensionless power gain of the detector. Unlike the approach used in the seminal work of Caves [Phys. Rev. D, 26, 1817 (1982)], the linear-response approach directly involves the noise properties of the detector, and allows one to derive simple necessary and sufficient conditions for reaching the quantum limit. Our results have direct relevance to recent experiments on nanoelectromechanical systems, and complement recent theoretical studies of particular mesoscopic position detectors.

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