The Journal of Physical Chemistry Letters· 2026Q1
Computational Study of Entangled Two-Photon Absorption in Organic Dyes
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- Q1SCImago
- 2026year
Short summary
A TD-DFT framework predicts that nondegenerate photon pairs enhance entangled two-photon absorption (ETPA) in organic dyes when one photon is near resonance with a one-photon transition, clarifying this as a sum-over-states effect rather than a quantum advantage.
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Key points
- A TD-DFT framework is presented to predict and clarify mechanisms of ETPA in organic chromophores.
- Nondegenerate photon pairs enhance ETPA intensity when one photon approaches resonance with a one-photon absorption (OPA) transition.
- This enhancement is identified as a near-resonant, sum-over-states effect, not a quantum advantage unique to entanglement.
- Entanglement's role is described as a correlation-induced weighting of the joint spectral amplitude, reducing to classical TPA in the limit.
- The method predicts spectral trends over broad energy ranges, despite typical TD-DFT blue shifts.
AI-generated from the title and abstract; the full text is not read.
Abstract
Abstract Entangled two-photon absorption (ETPA) offers advantages for quantum spectroscopy, including linear scaling with photon flux and reduced photodamage, yet distinguishing it from competing one-photon processes remains experimentally challenging. We present a predictive framework based on time-dependent density functional theory (TD-DFT) that clarifies the mechanisms shaping ETPA spectra in organic chromophores. Using rhodamine 6G and zinc tetraphenylporphyrin, we show that nondegenerate photon pairs enhance ETPA intensity when one photon approaches resonance with a one-photon absorption (OPA) transition. We clarify that this enhancement is a near-resonant, sum-over-states effect shared with classical two-photon absorption rather than a quantum advantage; entanglement instead acts through the joint spectral amplitude as a correlation-induced weighting that redistributes intensity and reduces to classical TPA in the appropriate limit. Despite the typical TD-DFT blue shift (∼0.5 eV), the method predicts spectral trends over energy ranges beyond those accessible by spontaneous parametric down-conversion, guiding experimental design.
The authors' abstract, as published at the source. The Journal of Physical Chemistry Letters, 2026 · DOI ↗
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