Promotionsvortrag Physik: Optical Parametric Amplification for the Detection of Quantum States

Ankündigung des Promotionsvortrags von: Herrn Mahmoud Kalash

Quantum states of light are becoming a key resource in modern photonic technologies owing to their unique nonclassical properties. They enable applications ranging from precision metrology and gravitational-wave detection to quantum communication and computing. While remarkable progress has been made in their generation and control, their efficient detection remains a major challenge.

This is particularly true for multimode quantum states, which are essential for high-dimensional quantum technologies. In this presentation, I present optical parametric amplification (OPA) as a powerful tool for the efficient detection of quantum states. I demonstrate the detection of multi-mode squeezing and, for the first time, the simultaneous monitoring of multimode entanglement.

Beyond squeezing detection, I show that OPA enables full quantum state tomography, applying it to squeezed vacuum and single-photon states. Finally, I present OPA as a platform for certifying the quantum features of optical states. In particular, I demonstrate that, by strongly amplifying a single-photon state, its quantum features can be revealed using conventional intensity measure-ments.

The presented results establish OPA as a compelling alternative to conventional detection tech-niques such as homodyne and single-photon detection, paving the way toward scalable optical quantum technologies.

(Vortrag auf Englisch)

Dem Vortrag schließt sich eine Diskussion von 15 Minuten an. Vortrag und Diskussion sind öffentlich. Diesen Verfahrensteilen folgt ein nicht öffentliches Rigorosum von 45 Minuten.