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AKjDPG: Arbeitskreis junge DPG

AKjDPG 4: Metrology

AKjDPG 4.2: Tutorium

Sonntag, 1. März 2026, 16:45–17:30, C 03

Quantum enhanced measurements — •Karol Gietka — University of Innssbruck

This tutorial offers an elementary and self-contained introduction to quantum-enhanced measurements, aimed at participants with a basic background in quantum mechanics. We discuss how quantum noise sets fundamental limits to measurement precision and how these limits can be overcome using genuinely quantum resources. The tutorial focuses on two representative platforms: noise squeezing in harmonic oscillators and entanglement in collective spin systems. In the first part, we introduce quadrature squeezing and show how redistributing quantum noise enables enhanced sensitivity. In the second part, we explore the role of maximally entangled spin states in precision measurements and illustrate how they lead to improved scaling beyond classical limits. Emphasis is placed on physical intuition and simple models.

Keywords: Quantum Metrology; Quantum Squeezing; Estimation Theory