2025-04-30 スウォンジー大学
＜関連情報＞
- https://www.swansea.ac.uk/press-office/news-events/news/2025/04/breakthrough-in-quantum-noise-reduction.php
- https://journals.aps.org/prresearch/abstract/10.1103/PhysRevResearch.7.023041
反射境界を用いた浮遊オプトメカニクスにおけるバックアクション抑制 Backaction suppression in levitated optomechanics using reflective boundaries
Rafał Gajewski and James Bateman
Physical Review Research Published: 11 April, 2025
DOI: https://doi.org/10.1103/PhysRevResearch.7.023041
Abstract
We show theoretically that the noise due to laser induced backaction acting on a small nanosphere levitated in a standing-wave trap can be considerably reduced by utilizing a suitable reflective boundary. We examine the spherical mirror geometry as a case study of this backaction suppression effect, discussing the theoretical and experimental constraints. We study the effects of laser recoil directly, by analyzing optical force fluctuations acting on a dipolar particle trapped at the center of a spherical mirror. We also compute the corresponding measurement imprecision in an interferometric, shot-noise-limited position measurement, using the formalism of Fisher information flow. Our results show that the standing-wave trapping field is necessary for backaction suppression in three dimensions, and they satisfy the Heisenberg limit of detection.
