Space-based mm/mg-scale Laser Interferometer for Quantum Gravity

• URL: http://arxiv.org/abs/2507.12899v1
• Date: Thu, 17 Jul 2025 08:37:21 GMT
• Title: Space-based mm/mg-scale Laser Interferometer for Quantum Gravity
• Authors: Nobuyuki Matsumoto, Katsuta Sakai, Kosei Hatakeyama, Kiwamu Izumi, Daisuke Miki, Satoshi Iso, Akira Matsumura, Kazuhiro Yamamoto,
• Abstract summary: We propose a space-based interferometer inspired by the LISA Pathfinder (LPF)<n>Our design employs two smaller gold-platinum test masses, each weighing the milligram scale, surrounded by a shield below 2 K, and positioned side by side with a millimeter scale separation.<n>We simulate quantum measurements of differential and common-mode motions to estimate the integration time for GIE detection.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• 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). Unlike the LPF, our design employs two smaller gold-platinum test masses, each weighing the milligram scale, surrounded by a shield below 2 K, and positioned side by side with a millimeter scale separation. This configuration enables the detection of GIE through simultaneous measurements of differential and common-mode motions. We simulate quantum measurements of these modes taking into account gas damping, black-body radiation, and cosmic-ray collisions to estimate the integration time for GIE detection. Our results show that GIE can be demonstrated with a few modifications to the LPF setup.

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