Stuttgart 2012 – scientific programme

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A: Fachverband Atomphysik

A 48: SYQM 1: Quantum limited measurement applications 1

A 48.2: Invited Talk

Friday, March 16, 2012, 11:00–11:30, V47.01

Quantum Limits and Quantum Enhancement in Magnetometry — Federica Beduini, Naeimeh Behbood, Yannick de Icaza, Brice Dubost, Marco Koschorreck, Mario Napolitano, Ana Predojevic, Robert Sewell, Florian Wolfgramm, and •Morgan Mitchell — ICFO-Institut de Ciencies Fotoniques, Mediterranean Technology Park, 08860 Castelldefels (Barcelona), Spain

Quantum Metrology uses entanglement and other quantum resources to improve the sensitivity of interferometric measurements. Strongly-interacting light-matter systems, or "quantum interfaces," offer several routes to improved sensitivity, including quantum non-demolition measurements, squeezing-enhanced optical readout of atomic sensors, and interaction-based measurements. I will describe recent experimental work that applies these quantum techniques in optical magnetometry, including sensitivity enhancements using optical entanglement, generation of squeezed states in magnetically-sensitive atomic ensembles, and interaction-based spin measurements that scale better than the so-called ``Heisenberg limit'' of sensitivity.