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Related Experiment Video

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Observation of detection-dependent multi-photon coherence times.

Young-Sik Ra1, Malte C Tichy, Hyang-Tag Lim

  • 1Department of Physics, Pohang University of Science and Technology (POSTECH), Pohang 790-784, Korea.

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|September 12, 2013
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The multi-photon coherence time, crucial for interference, depends on photon number and measurement. This finding impacts quantum interferometry sensitivity by highlighting the need for optimal detection schemes.

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Area of Science:

  • Quantum Optics
  • Quantum Information Science

Background:

  • Coherence time is critical for observing quantum interference.
  • Traditionally, photon coherence time is linked to spectral bandwidth.

Purpose of the Study:

  • To investigate multi-photon interference experiments.
  • To define and analyze multi-photon coherence time.

Main Methods:

  • Conducted multi-photon interference experiments.
  • Performed theoretical analysis of higher-order quantum effects.

Main Results:

  • Multi-photon coherence time depends on the number of interfering photons.
  • The chosen measurement scheme significantly affects the interference signal width.
  • Higher-order effects in particle indistinguishability cause this dependence.

Conclusions:

  • A single quantum state can show varying interference degrees based on the observable.
  • Optimal sensitivity in many-particle quantum interferometry requires careful selection of detection schemes.