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Generating indistinguishable single photons for quantum technologies is key. This study reveals crystal lattice vibrations limit photon coherence in solid-state systems, regardless of driving strength.

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Area of Science:

  • Quantum optics and condensed matter physics.
  • Solid-state quantum emitters and photon generation.

Background:

  • Coherent single photon generation is vital for quantum communication and processing.
  • Solid-state systems offer advantages but face decoherence from environmental couplings.
  • Weak-excitation limit and coherent scattering are strategies to mitigate dephasing.

Purpose of the Study:

  • To investigate the coherence of single photons from two-level and spin-Λ solid-state systems.
  • To understand the impact of environmental couplings, specifically vibronic transitions, on photon coherence.
  • To identify fundamental limitations to photon coherence in solid-state quantum emitters.

Main Methods:

  • Probing photon coherence from two-level and spin-Λ solid-state emitters.
  • Analyzing the coupling between atomic-like transitions and vibronic transitions.
  • Employing a polaron master equation to model non-Markovian dynamics of vibrational manifolds.

Main Results:

  • The coupling to crystal lattice vibronic transitions is independent of excitation driving strength.
  • This independence holds even for detuned excitation in spin-Λ configurations.
  • Non-Markovian dynamics of vibrational manifolds were captured by the polaron master equation.

Conclusions:

  • Environmental coupling to vibronic transitions fundamentally limits photon coherence in solid-state emitters.
  • The observed coupling is robust against variations in driving strength and excitation configuration.
  • These findings offer critical insights into the inherent limitations for achieving high-fidelity quantum information processing with solid-state sources.