Different Types of Photon Entanglement from a Constantly Driven Quantum Emitter Inside a Cavity

Tim Seidelmann*, Michael Cosacchi, Moritz Cygorek, Doris E. Reiter, Alexei Vagov, Vollrath M. Axt

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)
10 Downloads (Pure)


Bell states are the most prominent maximally entangled photon states. In a typical four-level emitter, like a semiconductor quantum dot, the photon states exhibit only one type of Bell state entanglement. By adding an external driving to the emitter system, also other types of Bell state entanglement are reachable without changing the polarization basis. In this work, it is shown under which conditions the different types of entanglement occur and analytical equations are given to explain these findings. Furthermore, special points are identified, where the concurrence, being a measure for the degree of entanglement, drops to zero, while the coherences between the two-photon states stay strong. Results of this work pave the way to achieve a controlled manipulation of the entanglement type in practical devices.

Original languageEnglish
Article number2000108
JournalAdvanced Quantum Technologies
Issue number1
Early online date14 Dec 2020
Publication statusPublished - 15 Jan 2021


  • entangled quantum states
  • optical cavities
  • quantum emitters
  • quantum entanglement
  • quantum optics

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Condensed Matter Physics
  • Statistical and Nonlinear Physics
  • Electronic, Optical and Magnetic Materials
  • Computational Theory and Mathematics
  • Mathematical Physics
  • Electrical and Electronic Engineering


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