2025-12-19 ミュンヘン大学（LMU）
Quantum physics trick
This so-called Dove prism, which Carlotta Versmold installed in the beam path of the interferometer, generates an additional reflection of the incident light. | © LMU / Weinfurter
＜関連情報＞
- https://www.lmu.de/en/newsroom/news-overview/news/making-tiny-movements-visible-66a57ac0.html
- https://journals.aps.org/prl/abstract/10.1103/fggq-yhz8
干渉増幅と外部ビームシフトの抑制 Interferometric Amplification and Suppression of External Beam Shifts
Carlotta Versmold, Jan Dziewior, Florian Huber, Elina Köster, Gregory Reznik, Lev Vaidman, and Harald Weinfurter
Physical Review Letters Published 17 December, 2025
DOI: https://doi.org/10.1103/fggq-yhz8
Abstract
Interferometers are known for precise measurements of the effects inside of them. Here we show that placing a Dove prism in one of the interferometer arms allows for also detecting minute effects happening outside the device. We derive how the additional reflection in one arm can amplify small tilts or displacements of the input beam in the dark output port of the interferometer, in analogy to weak value amplification. The experiment demonstrates a clear improvement of the measurement signal. Moreover, in the bright output port, small disturbances in the input beam get largely filtered, thereby enabling beam stabilization with a fully passive device.
