Hannover 2016 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 26: Quantum Optics IV
Q 26.5: Vortrag
Dienstag, 1. März 2016, 15:30–15:45, f442
Quantumness Quantification — •Melanie Mraz1, Jan Sperling2, Werner Vogel2, and Boris Hage1 — 1AG Experimentelle Quantenoptik, Insitut für Physik, Universität Rostock, Rostock, Deutschland — 2AG Theoretische Quantenoptik, Insitut für Physik, Universität Rostock, Rostock, Deutschland
Nonclassical quantum states have an advantage over classical states for various applications. Hence, it is of a fundamental interest to study properties of these states. It is already possible to say if a state is nonclassical or not, but how can we decide how much nonclassicality is in our system? We propose a degree of nonclassicality being a nonclassicality measure. It is determined by the decomposition of a quantum state into superpositions of coherent states. On the one hand, coherent states resembles the behavior of a classical harmonic oscillator most closely. On the other hand, the more quantum superpositions of coherent states are needed, the more quantum interferences arise. A method for such a decomposition of quantum states is presented and the degree of nonclassicality is determined for different states theoretically. Following this approach the next step is to apply this measure to an experiment. But how can we extract the information necessary to estimate the amount of quantumness in our system? Therefore pattern functions are used to reconstruct a density matrix in coherent state basis. This basis is chosen as the quantumness measure itself is based on superpositions of coherent states. Using this method we will try to witness the amount of nonclassicality in our system.