Mainz 2026 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 46: Open Quantum Systems II
Q 46.1: Invited Talk
Thursday, March 5, 2026, 11:00–11:30, P 4
Squeezed Light and Optimal Phase Estimation for Quantum Metrology — •Mojdeh Shikhali Najafabadi1, Luis L. Sánchez-Soto2, Joel F. Corney3, and Gerd Leuchs1,4 — 1Max Planck Institute for the Science of Light — 2Departamento de Óptica, Facultad de Física, Universidad Complutense, 28040 Madrid, Spain — 3School of Mathematics and Physics, University of Queensland, Brisbane, Queensland 4072, Australia — 4Institut für Optik, Information und Photonik, Friedrich-Alexander-Universität Erlangen-Nürnberg, 91058 Erlangen, Germany
Quantum metrology has progressed rapidly over the past decade, yet many approaches still rely on idealised models or tightly controlled laboratory conditions that limit their practical relevance. At its core, quantum metrology relies on four key stages -probe preparation, parameter encoding, measurement, and estimation- each of which must be optimised to achieve precision beyond classical limits. In this talk, I focus on some central components of this framework. First, I introduce squeezed states and phase-space approaches, with emphasis on the generation of quantum resources using resonance-based light-matter interactions and Kerr nonlinearities. I present our theoretical study of squeezing mechanisms arising from resonant nonlinear interactions between a coherent optical pulse and an atomic vapour confined within photonic crystal fibres. Finally, I discuss an asymptotically optimal phase-estimation protocol based on Adaptive Quantum State Estimation (AQSE) for squeezed vacuum states and present recent results from our work.