Journal
NATURE PHYSICS
Volume 5, Issue 12, Pages 909-914Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/NPHYS1425
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Funding
- Max Planck Society
- ERC Starting Grant [SiMP]
- MINOS
- Marie Curie Excellence Grant
- Nanosystems Initiative Munich
- Deutsche Forschungsgemeinschaft [Ko 416/18]
- German Excellence Initiative through the Nanosystems Initiative Munich (NIM)
- LMUexcellent as well as LMUinnovativ
- Marie Curie Intra European Fellowship
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Cavity-enhanced radiation-pressure coupling between optical and mechanical degrees of freedom allows quantum-limited position measurements and gives rise to dynamical backaction, enabling amplification and cooling of mechanical motion. Here, we demonstrate purely dispersive coupling of high-Q nanomechanical oscillators to an ultrahigh-finesse optical microresonator via its evanescent field, extending cavity optomechanics to nanomechanical oscillators. Dynamical backaction mediated by the optical dipole force is observed, leading to laser-like coherent nanomechanical oscillations solely due to radiation pressure. Moreover, sub-fm Hz(-1/2) displacement sensitivity is achieved, with a measurement imprecision equal to the standard quantum limit (SQL), which coincides with the nanomechanical oscillator's zero-point fluctuations. The achievement of an imprecision at the SQL and radiation-pressure dynamical backaction for nanomechanical oscillators may have implications not only for detecting quantum phenomena in mechanical systems, but also for a variety of other precision experiments. Owing to the flexibility of the near-field coupling platform, it can be readily extended to a diverse set of nanomechanical oscillators. In addition, the approach provides a route to experiments where radiation-pressure quantum backaction dominates at room temperature, enabling ponderomotive squeezing or quantum non-demolition measurements.
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