Approaching the Quantum "Limit" for Force Detection
- 26 October 1981
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 47 (17), 1184-1187
- https://doi.org/10.1103/physrevlett.47.1184
Abstract
A system is proposed for detecting the effect of a weak classical force on a macroscopic mechanical oscillator. The novel feature is a type of ac bridge coupled to a SQUID amplifier. A detailed sensitivity calculation for one type of bridge excitation is reported which shows what is required to reach the standard quantum "limit." Another type of excitation should make it a "back-action evasion" device capable of exceeding the standard quantum "limit".Keywords
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