50-km Fiber Interferometer for Testing Gravitational Signatures in Quantum Interference
- Author(s)
- Haocun Yu, Dorothea Macri, Thomas Morling, Eleonora Polini, Thomas Mieling, Peter Barrow, Begüm Kabagöz, Xinhui Yin, Piotr T. Chruściel, Christopher Hilweg, Eric Oelker, Nergis Mavalvala, Philip Walther
- Abstract
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 4.42×10−6 rad rms within the frequency range of 0.01–5 Hz. We demonstrate that this sensitivity is sufficient to resolve a phase-shift signal of 6.18(44)×10−5 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.
- Organisation(s)
- Research Network Quantum Aspects of Space Time, Quantum Optics, Quantum Nanophysics and Quantum Information
- External organisation(s)
- Massachusetts Institute of Technology, Polish Academy of Sciences
- Journal
- Physical Review Letters
- Volume
- 136
- No. of pages
- 7
- ISSN
- 0031-9007
- DOI
- https://doi.org/10.1103/yvlk-t1j9
- Publication date
- 03-2026
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 103026 Quantum optics
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/bde0b35d-3004-4bad-bd25-9f9ee0602f46