Space-based cm/kg-scale Laser Interferometer for Quantum Gravity
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arXiv
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| Format: | Preprint |
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2025
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| author | Matsumoto, Nobuyuki Sakai, Katsuta Hatakeyama, Kosei Izumi, Kiwamu Miki, Daisuke Iso, Satoshi Matsumura, Akira Yamamoto, Kazuhiro |
| author_facet | Matsumoto, Nobuyuki Sakai, Katsuta Hatakeyama, Kosei Izumi, Kiwamu Miki, Daisuke Iso, Satoshi Matsumura, Akira Yamamoto, Kazuhiro |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_12899 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Space-based cm/kg-scale Laser Interferometer for Quantum Gravity Matsumoto, Nobuyuki Sakai, Katsuta Hatakeyama, Kosei Izumi, Kiwamu Miki, Daisuke Iso, Satoshi Matsumura, Akira Yamamoto, Kazuhiro General Relativity and Quantum Cosmology Instrumentation and Methods for Astrophysics Instrumentation and Detectors Quantum Physics 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. |
| title | Space-based cm/kg-scale Laser Interferometer for Quantum Gravity |
| topic | General Relativity and Quantum Cosmology Instrumentation and Methods for Astrophysics Instrumentation and Detectors Quantum Physics |
| url | https://arxiv.org/abs/2507.12899 |