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Probing Electron-Phonon Interaction through Two-Photon Interference in Resonantly Driven Semiconductor Quantum Dots.

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Photon coherence in quantum dots (QDs) degrades due to electron-phonon coupling, not spectral diffusion. Two distinct phonon-related decoherence processes were identified, impacting two-photon interference visibility differently at various temperatures.

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Area of Science:

  • Quantum optics
  • Solid-state physics
  • Materials science

Background:

  • Photon coherence is crucial for quantum information processing.
  • Quantum dots (QDs) are promising solid-state emitters for quantum applications.
  • Understanding decoherence mechanisms in QDs is essential for device performance.

Purpose of the Study:

  • To investigate the temperature dependence of photon coherence properties in a single quantum dot (QD).
  • To identify the specific decoherence mechanisms affecting photon indistinguishability.
  • To develop a microscopic theory for phonon-induced decoherence in QDs.

Main Methods:

  • Two-photon interference (TPI) measurements under resonant excitation.
  • Temperature-dependent analysis of TPI visibility.
  • Development of a complementary microscopic theory.

Main Results:

  • Loss of indistinguishability is solely dependent on electron-phonon coupling, unaffected by spectral diffusion.
  • Two distinct phonon-associated decoherence processes identified.
  • Below 10 K, non-Markovian lattice relaxation (real phonon transitions) dominates TPI visibility loss.
  • Above 10 K, virtual phonon transitions to excited states become the primary dephasing mechanism.

Conclusions:

  • Electron-phonon coupling is the key factor limiting photon coherence in QDs.
  • Distinct phonon-mediated processes govern decoherence at different temperature regimes.
  • The developed theory provides analytic expressions for phonon-induced dephasing rates.