Freiburg 2024 – scientific programme

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SYQO: Symposium Ultrafast Quantum Nano-Optics

SYQO 1: Ultrafast Quantum Nano-Optics

SYQO 1.3: Invited Talk

Friday, March 15, 2024, 12:00–12:30, Paulussaal

Quantum dot sources: efficiency, entanglement, and correlations. — •Ana Predojević — Stockholm University, Stockholm, Sweden

Single quantum dots are established emitters of single photons and entangled photon pairs. By means of resonant excitation they efficiently generate photon pairs that feature low multi-photon contribution and are suitable for entangling schemes such as polarization and time-bin entanglement. However, the achievable degree of entanglement and the source readiness to be deployed in quantum communication protocols depend on additional functionalities, including high collection efficiency of photons. I will present engineered photonic systems that allow for entangled photon pair sources to be more efficient. Also, the cascaded generation of photon pairs intrinsically contain temporal correlations, which negatively affect the ability of such sources to perform two-photon interference, hindering applications. I will show how such correlation interplays with decoherence and temporal postselection, and under which conditions the temporal postselection could improve the two-photon interference visibility. Our study identifies crucial parameters of the source and indicates the path towards achieving optimal performance.

Keywords: Quantum optics; Quantum light; Photon pair sources