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Two-photon excitation sets limit to entangled photon pair generation from quantum emitters

Title data

Seidelmann, Tim ; Schimpf, C. ; Bracht, T. K. ; Cosacchi, Michael ; Vagov, Alexei ; Rastelli, A. ; Reiter, D. E. ; Axt, Vollrath Martin:
Two-photon excitation sets limit to entangled photon pair generation from quantum emitters.
In: Physical Review Letters. Vol. 129 (2022) Issue 19 . - No. 193604.
ISSN 1079-7114
DOI: https://doi.org/10.1103/PhysRevLett.129.193604

Official URL: Volltext

Project information

Project financing: Deutsche Forschungsgemeinschaft
Austrian Science Fund (FWF) via the Research Group FG5 and the I 4380 and the Austrian Research Promotion Agency (FFG), Grant No. 891366

Abstract in another language

Entangled photon pairs are key to many novel applications in quantum technologies. Semiconductor quantum dots can be used as sources of on-demand, highly entangled photons. The fidelity to a fixed maximally entangled state is limited by the excitonic fine-structure splitting. This work demonstrates that, even if this splitting is absent, the degree of entanglement cannot reach unity when the excitation pulse in a two-photon resonance scheme has a finite duration. The degradation of the entanglement has its origin in a dynamically induced splitting of the exciton states caused by the laser pulse itself. Hence, in the setting explored here, the excitation process limits the achievable concurrence for entangled photons generated in an optically excited four-level quantum emitter.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: entangled quantum states; optical cavities; quantum emitters; quantum entanglement; quantum optics; photon entanglement
Subject classification: condensed matter physics (theoretical)
Institutions of the University: Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Theoretical Physics III > Chair Theoretical Physics III - Univ.-Prof. Dr. Martin Axt
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 530 Physics
Date Deposited: 07 Nov 2022 07:25
Last Modified: 07 Nov 2022 07:25
URI: https://eref.uni-bayreuth.de/id/eprint/72705