Dresden 2020 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 26: Focus Session: Integrated Quantum Photonics I

HL 26.2: Invited Talk

Tuesday, March 17, 2020, 10:00–10:30, POT 51

Resonant excitation and coherent manipulation of quantum dots for quantum information experiments — •Ana Predojevic — Stockholm University, Stockholm, Sweden

Single self-assembled quantum dots are established emitters of single photons and entangled photon pairs. To be used in quantum information experiments quantum dots need to be excited resonantly and coherently. The use of resonant excitation makes this system well suitable for generation of photon pairs with near-unity efficiency and high purity and also for entangling schemes such as time-bin entanglement. The entanglement of photons generated by quantum dot systems can be employed in free space-and fibre-based quantum communication. In addition to this, the versatility of entanglement can be more optimally used and explored if the photons are entangled simultaneously in more than one degree of freedom - hyperentangled, which was also recently shown to be possible using quantum dots. However, the achievable degree of entanglement and readiness of the source for use in quantum communication protocols, depend on several additional functionalities such as high collection efficiency and coherence of the emitted photon pairs. Here, we will address engineered photonic systems that promise a more efficient and better performing sources of entangled photon pairs.