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We studied two-photon absorption in a three-band system interacting with a noisy bath. Correlations in energy fluctuations significantly impact absorption signals, potentially obscuring transitions or eliminating extra peaks in entangled systems.

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Area of Science:

  • Quantum optics
  • Condensed matter theory
  • Spectroscopy

Background:

  • Two-photon absorption (TPA) is crucial for materials characterization.
  • Understanding energy level fluctuations in quantum systems is key to controlling optical properties.
  • Coupling to a bath can significantly alter spectral features.

Purpose of the Study:

  • Investigate the impact of correlated energy fluctuations on TPA signals in a three-band system.
  • Analyze the emergence and disappearance of spectral peaks under different modulation limits.
  • Explore the role of photon entanglement in TPA spectra.

Main Methods:

  • Theoretical investigation using a three-band model (g, e, f).
  • Modeling the bath as an over-damped Brownian oscillator with correlated Gaussian energy modulations.
  • Analysis of classical two-photon absorption (CTPA) and entangled two-photon absorption spectra.

Main Results:

  • Fast modulation leads to extra peaks (2ωeg, 2ωfe) in CTPA spectra, obscuring g-f transitions.
  • These extra peaks vanish in the slow modulation limit due to Gaussian line shape properties.
  • CTPA spectral features are highly sensitive to the correlation of energy fluctuations.
  • Entangled two-photon absorption eliminates extra peaks due to distinct spectral bandwidths.

Conclusions:

  • Energy fluctuation correlations are critical determinants of TPA spectral shapes.
  • Entangled photons offer a pathway to cleaner TPA signals by suppressing unwanted features.
  • The study provides insights into controlling and interpreting TPA in noisy quantum environments.