50-km fiber interferometer for testing gravitational signatures in quantum interference
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arXiv
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| Format: | Preprint |
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2025
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| author | Yu, Haocun Macri, Dorotea Morling, Thomas Polini, Eleonora Mieling, Thomas B. Barrow, Peter Kabagöz, Begüm Yin, Xinghui Chruściel, Piotr T. Hilweg, Christopher Oelker, Eric Mavalvala, Nergis Walther, Philip |
| author_facet | Yu, Haocun Macri, Dorotea Morling, Thomas Polini, Eleonora Mieling, Thomas B. Barrow, Peter Kabagöz, Begüm Yin, Xinghui Chruściel, Piotr T. Hilweg, Christopher Oelker, Eric Mavalvala, Nergis Walther, Philip |
| contents | Quantum mechanics and general relativity are the foundational pillars of modern physics, yet experimental tests that combine the two frameworks remain rare. Measuring optical phase shifts of massless photons in a gravitational potential provides a unique quantum platform to probe gravity beyond Newtonian descriptions, but laboratory-based interferometers have not yet reached the sensitivity needed to access this regime. Here, we report the realization of a 50-km table-top Mach-Zehnder fiber interferometer operating at the single-photon level, achieving a phase sensitivity of $4.42\times10^{-6}$ rad root-mean-square (RMS) within the frequency range of 0.01 Hz to 5 Hz. We demonstrate that this sensitivity is sufficient to resolve a phase-shift signal of $(6.18 \pm 0.44)\times10^{-5}$ rad RMS at 0.1 Hz, associated with a modulated gravity-induced signal. Our results establish a milestone for quantum sensing with large-scale optical interferometry, demonstrating the capability to detect gravitational redshifts in a local laboratory, thereby paving the way for testing quantum phenomena within general relativistic frameworks. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_17022 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | 50-km fiber interferometer for testing gravitational signatures in quantum interference Yu, Haocun Macri, Dorotea Morling, Thomas Polini, Eleonora Mieling, Thomas B. Barrow, Peter Kabagöz, Begüm Yin, Xinghui Chruściel, Piotr T. Hilweg, Christopher Oelker, Eric Mavalvala, Nergis Walther, Philip Quantum Physics General Relativity and Quantum Cosmology Quantum mechanics and general relativity are the foundational pillars of modern physics, yet experimental tests that combine the two frameworks remain rare. Measuring optical phase shifts of massless photons in a gravitational potential provides a unique quantum platform to probe gravity beyond Newtonian descriptions, but laboratory-based interferometers have not yet reached the sensitivity needed to access this regime. Here, we report the realization of a 50-km table-top Mach-Zehnder fiber interferometer operating at the single-photon level, achieving a phase sensitivity of $4.42\times10^{-6}$ rad root-mean-square (RMS) within the frequency range of 0.01 Hz to 5 Hz. We demonstrate that this sensitivity is sufficient to resolve a phase-shift signal of $(6.18 \pm 0.44)\times10^{-5}$ rad RMS at 0.1 Hz, associated with a modulated gravity-induced signal. Our results establish a milestone for quantum sensing with large-scale optical interferometry, demonstrating the capability to detect gravitational redshifts in a local laboratory, thereby paving the way for testing quantum phenomena within general relativistic frameworks. |
| title | 50-km fiber interferometer for testing gravitational signatures in quantum interference |
| topic | Quantum Physics General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2511.17022 |