Journal
SCIENCE
Volume 339, Issue 6121, Pages 801-804Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1231282
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Funding
- Defense Advanced Research Projects Agency Quantum-Assisted Sensing and Readout program
- Office of Naval Research Young Investigator Program
- JILA NSF Physics Frontier Center
- National Research Council
- Clare Boothe Luce foundation
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The quantum mechanics of position measurement of a macroscopic object is typically inaccessible because of strong coupling to the environment and classical noise. In this work, we monitor a mechanical resonator subject to an increasingly strong continuous position measurement and observe a quantum mechanical back-action force that rises in accordance with the Heisenberg uncertainty limit. For our optically based position measurements, the back-action takes the form of a fluctuating radiation pressure from the Poisson-distributed photons in the coherent measurement field, termed radiation pressure shot noise. We demonstrate a back-action force that is comparable in magnitude to the thermal forces in our system. Additionally, we observe a temporal correlation between fluctuations in the radiation force and in the position of the resonator.
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