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Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.
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50-km Fiber Interferometer for Testing Gravitational Signatures in Quantum Interference.

Haocun Yu1,2, Dorotea Macri3, Thomas Morling1,2,4

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Summary
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Scientists developed a 50-km fiber interferometer to measure quantum mechanics and general relativity effects. This quantum sensing breakthrough achieved unprecedented phase sensitivity, enabling detection of gravity-induced phase shifts in a lab setting.

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Area of Science:

  • Quantum physics
  • General relativity
  • Experimental physics

Background:

  • Quantum mechanics and general relativity are fundamental but experimentally challenging to unify.
  • Previous laboratory experiments lacked the sensitivity to probe quantum effects in gravitational fields.

Purpose of the Study:

  • To develop a sensitive experimental platform for testing quantum mechanics within general relativity.
  • To measure optical phase shifts of photons in a gravitational potential.

Main Methods:

  • Realization of a 50-km table-top Mach-Zehnder fiber interferometer.
  • Operation at the single-photon level.
  • Achieved phase sensitivity of 4.42×10⁻⁶ rad rms (0.01–5 Hz).

Main Results:

  • Demonstrated sufficient sensitivity to resolve a gravity-induced phase shift signal of 6.18(44)×10⁻⁵ rad rms at 0.1 Hz.
  • Successfully detected modulated gravity-induced signals.

Conclusions:

  • This work represents a milestone in quantum sensing using large-scale optical interferometry.
  • Enables detection of gravitational redshifts in a local laboratory.
  • Paves the way for testing quantum phenomena in general relativistic frameworks.