Stuttgart 2012 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 31: Quanteninformation: Konzepte und Methoden 4

Q 31.3: Talk

Tuesday, March 13, 2012, 14:30–14:45, V7.01

How the dynamics of a continuous quantum field can be encoded by discrete ensembles — •Zoltan Kadar, Michael Keyl, and Zoltan Zimboras — Quantum Information Unit, ISI Foundation, Torino, Italy

Many spins can collectively couple to a continuous quantum field such that the ensemble approximate the state of the field well. Is this approximation also preserved during the time evolution? The answer largely depends on the state of the ensemble and is already challenging for quadratic Hamiltonians. The key is to use the appropriate collective quantities, the fluctuator operators (familiar from mean field theory) and the good limiting procedure. Important applications are light-matter interface experiments, which are used to implement a type of quantum memory.