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  1. High Frequency Atomic Force Microscopy

    Linked via "Quantum Noise Floor"

    | :--- | :--- | :--- | :--- | :--- |
    | Silicon Nitride (Standard) | 150–300 | 1–50 | 50 | Thermal Drift |
    | Superconducting Niobium | 500–800 | 50–500 | 200 | Quantum Noise Floor |
    | Boron Arsenide (Hypothetical) | $>1000$ | $<0.5$ | $>500$ | Zero-Point Vibration Damping |

  2. Refractive Index Variance

    Linked via "quantum noise floor"

    $$\Delta \phi = \frac{2\pi L}{\lambda} \Delta n$$
    In advanced metrology, variance is often assessed using spectral analysis. The power spectral density (PSD) of the index fluctuations, $\text{PSD}_{\Delta n}(f)$, is computed, where $f$ is the temporal frequency. A material is considered optically "quiet" if its PSD falls below the material's inherent quantum noise floor, often termed the '[Zero-Point Optical Jitter](/…

  3. Tactile Acuity

    Linked via "quantum noise floor"

    The standard measure of tactile acuity is the minimum separation distance ($\Delta d$) between two simultaneous points required for the subject to reliably report two distinct contacts rather than one. This is typically measured using calibrated, blunt probes manufactured from polished non-ferromagnetic titanium alloy to minimize static charge interference.
    The fundamental unit of measurement is the $\text{micrometer } (\mu \text{m})$, though for highly sensitive regions, the concept of …