English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

The cascaded decay in a four-level quantum emitter is a well establishedmechanism to generate polarization entangled photon pairs, the building blocksof many applications in quantum technologies. The four most prominent maximallyentangled photon pair states are the Bell states. In a typical experiment basedon an undriven emitter only one type of Bell state entanglement can be observedin a given polarization basis. Other types of Bell state entanglement in thesame basis can be created by continuously driving the system by an externallaser. In this work we propose a protocol for time-dependent entanglementswitching in a four-level quantum emitter--cavity system that can be operatedby changing the external driving strength. By selecting different two-photonresonances between the laser-dressed states, we can actively switch back andforth between the different types of Bell state entanglement in the same basisas well as between entangled and nonentangled photon pairs. This remarkablefeature demonstrates the possibility to achieve a controlled, time-dependentmanipulation of the entanglement type that could be used in many innovativeapplications.

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