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Related Concept Videos

Fluorescence and Phosphorescence: Instrumentation01:25

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Fluorometers and spectrofluorometers are two types of instruments used for measuring molecular fluorescence. These instruments differ in how they select excitation and emission wavelengths and the type of light sources they utilize. Fluorometers use absorption interference filters to choose excitation and emission wavelengths. The excitation source in a fluorometer is typically a low-pressure mercury vapor lamp that emits intense lines distributed throughout the ultraviolet and visible regions.
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Confocal microscopy is an advanced microscopic technique. The prime advantage of the confocal microscope over other microscopy techniques is its ability to block the out-of-focus light from the illuminated samples using pinholes. It is widely used with fluorescence optics to obtain high-resolution, sharp contrast images. Unlike optical microscopes, confocal microscopes use a focused beam of light laser to scan the entire sample surface at different z-planes. These microscopes are, therefore,...
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Related Experiment Video

Updated: Jan 10, 2026

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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Two-photon induced coherence without induced emission.

Dong-Gil Im1, Seung-Yeun Yoo1, Chung-Hyun Lee1

  • 1Department of Physics, Pohang University of Science and Technology (POSTECH), Pohang 37673, Korea.

Science Advances
|November 21, 2025
PubMed
Summary
This summary is machine-generated.

Researchers observed two-photon induced coherence without induced emission, doubling phase modulation sensitivity. This breakthrough uses two-photon Fock states for enhanced quantum metrology with undetected photons.

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Area of Science:

  • Quantum Optics
  • Quantum Metrology

Background:

  • Induced coherence without induced emission enables quantum imaging and spectroscopy in challenging wavelength regimes.
  • Previous research focused on single-photon phenomena, limiting the application of multiphoton states for enhanced phase sensitivity.

Purpose of the Study:

  • To observe and demonstrate two-photon induced coherence without induced emission.
  • To explore the potential of two-photon Fock states for enhanced quantum metrology.

Main Methods:

  • Utilizing a two-photon Fock state to establish quantum coherence between two-photon spontaneous emission amplitudes.
  • Applying a phase shift to undetected 1016-nanometer photons.

Main Results:

  • Observed genuine two-photon induced coherence without induced emission.
  • Demonstrated a doubling of interferometric phase modulation.
  • Showed that a phase shift on undetected photons causes modulation in detected photons at a different wavelength.

Conclusions:

  • Two-photon induced coherence without induced emission is achievable.
  • This technique enhances phase sensitivity in quantum metrology.
  • Opens new avenues for multiphoton quantum-enhanced phase measurements without detecting modulated photons.