Selective Biexciton Generation Under Energy-Time Entangled Quantum Light in Quantum Dots

Abstract

Quantum light provides opportunities for controlling multiphoton absorption beyond classical limits. Here, we investigate biexciton generation in nanocrystal quantum dots driven by energy-time-entangled photon pairs generated via spontaneous parametric down-conversion. We show that frequency-time correlations between pairs of photons increase the population of biexcitons over excitons, thereby lending specificity to the excitation of many-body states. By employing a three-level model, we demonstrate that biexciton generation depends nontrivially on the photon entanglement time and the pump bandwidth. We find that maximizing efficiency requires an optimally shaped entangled photon field rather than simply scaling parameters for a monotonic improvement. Extending to a realistic CdSe/CdS core-shell quantum dot containing many excitonic states coupled to the quantum field, we demonstrate that increasing the bi-photon arrival-time entanglement (closer arrival time) enhances constructive pathway interference and expands accessible excitation channels while preserving better energy-conservation excitation than classical light when generating biexcitons. Furthermore, tuning the time correlation properties enables selective excitation of closely spaced biexciton states. These results establish entangled photons as a tool for selective excitation and control of higher-order excited states in quantum-confined systems.

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BibTeX RIS

BibTeX

@misc{peng2026selective,
  title = {{Selective Biexciton Generation Under Energy-Time Entangled Quantum Light in Quantum Dots}},
  author = {Kaiyue Peng and Chieh Tsao and Hendrik Utzat and Eran Rabani},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2605.26466},
  eprint = {2605.26466},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2605.26466},
  note = {CC BY-NC-SA 4.0},
}

RIS

TY  - UNPB
TI  - Selective Biexciton Generation Under Energy-Time Entangled Quantum Light in Quantum Dots
AU  - Kaiyue Peng
AU  - Chieh Tsao
AU  - Hendrik Utzat
AU  - Eran Rabani
PY  - 2026
DA  - 2026/09/25
PB  - arXiv
DO  - 10.48550/arxiv.2605.26466
UR  - https://arxiv.org/abs/2605.26466
AB  - Quantum light provides opportunities for controlling multiphoton absorption beyond classical limits. Here, we investigate biexciton generation in nanocrystal quantum dots driven by energy-time-entangled photon pairs generated via spontaneous parametric down-conversion. We show that frequency-time correlations between pairs of photons increase the population of biexcitons over excitons, thereby lending specificity to the excitation of many-body states. By employing a three-level model, we demonstrate that biexciton generation depends nontrivially on the photon entanglement time and the pump bandwidth. We find that maximizing efficiency requires an optimally shaped entangled photon field rather than simply scaling parameters for a monotonic improvement. Extending to a realistic CdSe/CdS core-shell quantum dot containing many excitonic states coupled to the quantum field, we demonstrate that increasing the bi-photon arrival-time entanglement (closer arrival time) enhances constructive pathway interference and expands accessible excitation channels while preserving better energy-conservation excitation than classical light when generating biexcitons. Furthermore, tuning the time correlation properties enables selective excitation of closely spaced biexciton states. These results establish entangled photons as a tool for selective excitation and control of higher-order excited states in quantum-confined systems.
ER  -

Abstract

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