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Preprint Oct 2026

Vector field dark matter search with Sagnac interferometer

We present the first calculation showing that a material-asymmetric Sagnac speed meter can improve quantum-noise-limited sensitivity to $B-L$ vector dark matter by nearly two orders of magnitude over a Fabry--Perot Michelson position meter at the low-mass end of the band. We introduce material contrast into a dual-ring...

Y. Inoue, Q. Nguyen, Ippei Obata · 0 citations
Preprint Sep 2026

Observing and evading quantum back-action on a kilogram-scale oscillator

Continuous quantum displacement measurements are fundamentally limited by a trade-off between readout imprecision and measurement back-action, constrained by the Heisenberg uncertainty principle. In the Laser Interferometric Gravitational-Wave Observatory (LIGO), these two quantum noise components dominate much of the...

Begüm Kabagöz, E. Oelker, Dhruva Ganapathy et al. · 0 citations

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