article published yes Martynas Skrabulis author Martin Colombano Sosa author Nicola Carlon Zambon author Andrei Militaru author d67706f8-8eb1-11ee-ad1b-9c30dfa19e0b Massimiliano Rossi author Martin Frimmer author Lukas Novotny author JoFi department The sensitivity of a mechanical transducer is ultimately limited by its inherent quantum fluctuations. Here, we use an optically levitated nanoparticle to measure impulsive forces smaller than the particle’s zero-point momentum uncertainty. Our approach relies on reversibly squeezing the levitated particle’s center-of-mass motion to coherently amplify the perturbation. We demonstrate an impulsive-force resolution as small as 6.9  keV/c, a value 0.6 dB below the sensor’s zero-point value. American Physical Society2026 eng 0031-9007 1079-7114 2601.1939210.1103/9wzm-3qyb 13623 Skrabulis, Martynas, Martin Colombano Sosa, Nicola Carlon Zambon, Andrei Militaru, Massimiliano Rossi, Martin Frimmer, and Lukas Novotny. “Nanomechanical Sensor Resolving Impulsive Forces below Its Zero-Point Fluctuations.” <i>Physical Review Letters</i>. American Physical Society, 2026. <a href="https://doi.org/10.1103/9wzm-3qyb">https://doi.org/10.1103/9wzm-3qyb</a>. Skrabulis M, Sosa MC, Zambon NC, Militaru A, Rossi M, Frimmer M, Novotny L. 2026. Nanomechanical sensor resolving impulsive forces below its zero-point fluctuations. Physical Review Letters. 136(23), 233604. Skrabulis, M., Sosa, M. C., Zambon, N. C., Militaru, A., Rossi, M., Frimmer, M., &#38; Novotny, L. (2026). Nanomechanical sensor resolving impulsive forces below its zero-point fluctuations. <i>Physical Review Letters</i>. American Physical Society. <a href="https://doi.org/10.1103/9wzm-3qyb">https://doi.org/10.1103/9wzm-3qyb</a> M. Skrabulis, M.C. Sosa, N.C. Zambon, A. Militaru, M. Rossi, M. Frimmer, L. Novotny, Physical Review Letters 136 (2026). M. Skrabulis <i>et al.</i>, “Nanomechanical sensor resolving impulsive forces below its zero-point fluctuations,” <i>Physical Review Letters</i>, vol. 136, no. 23. American Physical Society, 2026. Skrabulis, Martynas, et al. “Nanomechanical Sensor Resolving Impulsive Forces below Its Zero-Point Fluctuations.” <i>Physical Review Letters</i>, vol. 136, no. 23, 233604, American Physical Society, 2026, doi:<a href="https://doi.org/10.1103/9wzm-3qyb">10.1103/9wzm-3qyb</a>. Skrabulis M, Sosa MC, Zambon NC, et al. Nanomechanical sensor resolving impulsive forces below its zero-point fluctuations. <i>Physical Review Letters</i>. 2026;136(23). doi:<a href="https://doi.org/10.1103/9wzm-3qyb">10.1103/9wzm-3qyb</a> 222442026-07-05T22:01:36Z2026-07-06T07:07:24Z