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Journal Article

Quantum back-action in measurements of zero-point mechanical oscillations

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.
Farid Ya Khalili
Haixing Miao
Huan Yang
Amir H. Safavi-Naeini
Oskar Painter
Yanbei Chen
Journal Name
Phys. Rev. A
Publication Date
September, 2012