Heidelberg 2015 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 67: Quantum Information: Quantum Communication II

Q 67.1: Talk

Friday, March 27, 2015, 11:00–11:15, K/HS1

Quantum Metrology based on Multi-Photon Interference — •Alexander Müller, Simon Laibacher, Vincenzo Tamma, and Wolfgang Schleich — Institut für Quantenphysik, Universität Ulm, D 89069 Ulm

It is known that phase super-resolution and super-sensitivity can be achieved with entangled quantumstates, so called NOON-states. Unfortunately they are complicated to produce and to measure, especially for higher numbers of photons. On the other hand are thermal light sources easy to prepare and widely available. We investigate thermal states as the input sources of an interferometer and derive circumstances, under which they also show supersensitivity and superresolution. To make them practically usable, it is important to keep the visibility at a high level, even for high photon numbers.