Speaker
Description
The Swing-UP of quantum EmitteR (SUPER) scheme utilizes two red-detuned pulses to excite a quantum system. After its theoretical prediction for a two-level system [1], the SUPER scheme was experimentally demonstrated in quantum dots [2]. To explore the full possibilities of the SUPER scheme, a two-level emitter can be embedded in a photonic cavity, which introduces new phenomena.
In this talk, we will discuss the implications of applying SUPER to a quantum emitter in a photonic cavity. This allows us to consider SUPER in the few-photon limit, where we can link SUPER to few-photon scattering processes, as known from quantum optics. While transferring photons from one mode to the other, the two-level quantum emitter can be fully excited [3].
During the off-resonant excitation with strong pulses, the induced Stark effect shifts the quantum emitter out of resonance. As a results, the application of the SUPER scheme to a quantum dot in a cavity results in the creation of perfectly entangled photon pairs, even up to temperatures of 80K [4]. Additionally, the Stark effect influences the photon number coherence (PNC) of single photons generated via SUPER. While for resonant excitation, the PNC follows mostly the excitation probability and is strongly influenced by phonons, preliminary calculations indicate that SUPER significantly reduces PNC compared to the resonant case.
Unlocking the full potential of off-resonant excitation schemes, such as SUPER, promises to reveal even more intriguing phenomena in the future.
References:
[1] Bracht et al., PRX Quantum 2, 040354 (2021)
[2] Karli et al., Nano Lett. 22, 6567 (2022)
[2] Bracht et al,. Optica Quantum 1, 103 (2023)
[4] Richter et al., arXiv:2405.20095 (2024)
