Mechanically detecting and avoiding the quantum fluctuations of a microwave field

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Science  13 Jun 2014:
Vol. 344, Issue 6189, pp. 1262-1265
DOI: 10.1126/science.1253258

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Avoiding back-action in quantum measurements

The very process of measuring a quantum system has an influence on the system through the process of back-action. Suh et al. used a back-action evasion scheme to monitor the motion of a miniature oscillator without influencing its motion (see the Perspective by Bouwmeester). The scheme should help in the understanding of the fundamental limits associated with measurement and will have practical implications in providing a low-temperature thermometer and a probe of extremely weak forces.

Science, this issue p. 1262

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