Precision measurement of pressure with a wide dynamic range holds significance for various applications. This issue can be realized with a mechanical nano-oscillator, where the pressure-related collisions with surrounding molecules induce its energy dissipation. However, this energy dissipation of the nano-oscillator may be overshadowed by other processes. Here, we apply the second-order coherence analysis to accurately characterize those distinct decoherence processes. Based on an optically levitated nano-oscillator, we successfully obtain precise measurements of the air pressure surrounding the particles from atmosphere to $7\times {10}^{-6}$ mbar, over $8$ orders of magnitude. It proves that the mechanical nano-oscillator is an extremely promising candidate for precision pressure-sensing applications. Moreover, the second-order coherence analysis method on a classical system can pave the way to characterize the dynamic properties of an oscillator, which will benefit microscopic thermodynamics, precision measurement, and macroscopic quantum research.

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• Metrology
• Optomechanics
• Vacuum technology
• Nanomechanical devices
• Nanotechnology
• Optical tweezers
• Precision measurements