2026-07-31 東京大学
集光したレーザー光に捕捉された単一ナノ粒子（矢印の先の白い点）
＜関連情報＞
- https://www.t.u-tokyo.ac.jp/press/pr2026-07-31-001
- https://journals.aps.org/prl/abstract/10.1103/js43-kq48
量子消光によって感度を高めた浮遊型ナノ加速度計 Levitated Nano-accelerometer Sensitized by Quantum Quench
M. Kamba, S. Otabe, K. Funo, T. Sagawa,, and K. Aikawah
Physical Review Letters Published: 28 July, 2026
DOI: https://doi.org/10.1103/js43-kq48
Abstract
We realize a nanoscale accelerometer with a levitated nanoparticle near the ground state, exploiting its dynamical behavior triggered by the abrupt quench of its trapping potential. We find that rapid quenching provides a readout time at which the sensitivity is enhanced by 2 orders of magnitude with a favorable combination of a large acceleration-induced displacement and a reduced position uncertainty, enabling us to detect a weak acceleration obscured by the zero-point fluctuation in the initial potential. With rapid quenching, the observed sensitivity is in good agreement with a numerical simulation based on the quantum Langevin equation. Our results provide a step toward inertial sensing with levitated nanoparticles through time-optimal quench dynamics in the quantum regime.
