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This summary is machine-generated.

Researchers achieved a zeptosecond-scale detection limit for photon phase delay using Hong-Ou-Mandel interferometry. This fiber-coupled setup demonstrates optimal measurement performance, nearing the theoretical Cramer-Rao bound for precision.

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Cramér–Rao boundHong–Ou–Mandel interferometryphase delay estimation

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Area of Science:

  • Quantum optics
  • Quantum metrology
  • Photonics

Background:

  • Hong-Ou-Mandel interferometry is a cornerstone of quantum optics.
  • Statistical estimation theory has advanced measurement precision in interferometry.
  • Previous limits in photon delay and polarization measurement were significant.

Purpose of the Study:

  • To achieve unprecedented detection limits for photon phase delay.
  • To demonstrate a fully fiber-coupled Hong-Ou-Mandel interferometer operating at telecom wavelengths.
  • To validate experimental results against theoretical bounds.

Main Methods:

  • Utilized a common-path Hong-Ou-Mandel interferometer.
  • Employed a fiber-coupled setup for telecom wavelength operation.
  • Applied statistical estimation theory and calculated the Cramer-Rao bound (CRB).

Main Results:

  • Achieved a detection limit for photon phase delay at the zeptosecond scale.
  • Demonstrated the first common-path Hong-Ou-Mandel interferometry with zeptosecond precision.
  • Experimental results closely approached the theoretical CRB, indicating optimal measurement.

Conclusions:

  • The developed setup represents a significant advancement in quantum metrology.
  • The fiber-coupled system offers practical advantages for high-precision measurements.
  • The study validates the effectiveness of statistical estimation theory in pushing measurement limits.