期刊
SCIENCE
卷 344, 期 6189, 页码 1262-1265出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1253258
关键词
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资金
- Institute for Quantum Information and Matter, an NSF Physics Frontiers Center
- Gordon and Betty Moore Foundation [NSF-IQIM 1125565]
- Defense Advanced Research Projects Agency [DARPA-QUANTUM HR0011-10-1-0066]
- NSF [NSF-DMR 1052647, NSF-EEC 0832819]
- Direct For Mathematical & Physical Scien
- Division Of Physics [1205374, 1125565] Funding Source: National Science Foundation
Quantum fluctuations of the light field used for continuous position detection produce stochastic back-action forces and ultimately limit the sensitivity. To overcome this limit, the back-action forces can be avoided by giving up complete knowledge of the motion, and these types of measurements are called back-action evading or quantum nondemolition detection. We present continuous two-tone back-action evading measurements with a superconducting electromechanical device, realizing three long-standing goals: detection of back-action forces due to the quantum noise of a microwave field, reduction of this quantum back-action noise by 8.5 +/- 0.4 decibels (dB), and measurement imprecision of a single quadrature of motion 2.4 +/- 0.7 dB below the mechanical zero-point fluctuations. Measurements of this type will find utility in ultrasensitive measurements of weak forces and nonclassical states of motion.
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