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arXiv · 2507.12899

Space-based cm/kg-scale Laser Interferometer for Quantum Gravity

Nobuyuki Matsumoto·Katsuta Sakai·Kosei Hatakeyama·Kiwamu Izumi·Daisuke Miki·Satoshi Iso·Akira Matsumura·Kazuhiro Yamamoto
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Abstract

The experimental verification of the quantum nature of gravity represents a milestone in quantum gravity research. Recently, interest has grown for testing it via gravitationally induced entanglement (GIE). Here, we propose a space-based interferometer inspired by the LISA Pathfinder (LPF). Our design employs two kg-scale gold-platinum test masses which, unlike in the LPF, are surrounded by a shield below 1 K and positioned side-by-side with a centimeter-scale separation. This configuration enables the detection of GIE through simultaneous measurements of differential and common-mode motions. To estimate the integration time required for GIE detection, we simulate quantum measurements of these modes, considering noise sources such as gas damping, black-body radiation, and cosmic-ray collisions. Our results show that GIE can be demonstrated with a few modifications to the LPF setup.

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Nobuyuki Matsumoto, Katsuta Sakai, Kosei Hatakeyama, Kiwamu Izumi, Daisuke Miki, Satoshi Iso, Akira Matsumura, Kazuhiro Yamamoto. 2025-07-17. Space-based cm/kg-scale Laser Interferometer for Quantum Gravity. https://arxiv.org/abs/2507.12899

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