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Time-dependent switching of the photon entanglement type using a driven quantum emitter–cavity system

Title data

Seidelmann, Tim ; Reiter, D. E. ; Cosacchi, Michael ; Cygorek, M. ; Vagov, Alexei ; Axt, Vollrath Martin:
Time-dependent switching of the photon entanglement type using a driven quantum emitter–cavity system.
In: Applied Physics Letters. Vol. 118 (2021) Issue 16 . - 164001.
ISSN 1077-3118
DOI: https://doi.org/10.1063/5.0045377

Project information

Project financing: Deutsche Forschungsgemeinschaft

Abstract in another language

The cascaded decay in a four-level quantum emitter is a well-established mechanism to generate polarization-entangled photon pairs, the building blocks of many applications in quantum technologies. The four most prominent maximally entangled photon pair states are the Bell states. In a typical experiment based on an undriven emitter, only one type of Bell state entanglement can be observed in a given polarization basis. Other types of Bell state entanglement in the same basis can be created by continuously driving the system by an external laser. In this work, we propose a protocol for time-dependent entanglement switching in a four-level quantum emitter–cavity system that can be operated by changing the external driving strength. By selecting different two-photon resonances between the laser-dressed states, we can actively switch back and forth between the different types of Bell state entanglement in the same basis as well as between entangled and nonentangled photon pairs. This remarkable feature demonstrates the possibility to achieve a controlled, time-dependent manipulation of the entanglement type that could be used in many innovative applications.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: Condensed Matter Physics (theoretical)
Keywords: Entangled quantum states; Optical cavities; Quantum emitters; Quantum entanglement; Quantum optics; Photon entanglement
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: 03 May 2021 08:09
Last Modified: 03 May 2021 08:09
URI: https://eref.uni-bayreuth.de/id/eprint/65046