期刊
PHYSICAL REVIEW A
卷 86, 期 3, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.86.033840
关键词
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资金
- Russian Foundation for Basic Research [08-02-00580-a]
- NSF [PHY-0967049, PHY-0555406, PHY-0956189, PHY-1068881]
- David and Barbara Groce Startup Fund at Caltech
- DARPA/MTO ORCHID program through AFOSR
- Kavli Nanoscience Institute at Caltech
- NSERC
- Institute for Quantum Information and Matter
- Gordon and Betty Moore Foundation
- Direct For Mathematical & Physical Scien
- Division Of Physics [1068881, 0956189] Funding Source: National Science Foundation
- Direct For Mathematical & Physical Scien
- Division Of Physics [0967049, 1125565] Funding Source: National Science Foundation
Measurement-induced back-action, a direct consequence of the Heisenberg uncertainty principle, is the defining feature of quantum measurements. We use quantum measurement theory to analyze the recent experiment of Safavi-Naeini et al. [Phys. Rev. Lett. 108, 033602 (2012)], and show that the results of this experiment not only characterize the zero-point fluctuation of a near-ground-state nanomechanical oscillator, but also demonstrate the existence of quantum back-action noise-through correlations that exist between sensing noise and back-action noise. These correlations arise from the quantum coherence between the mechanical oscillator and the measuring device, which build up during the measurement process, and are key to improving sensitivities beyond the standard quantum limit.
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