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Indeterminism and Decoherence in Standard Quantum Theory

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In the fi rst part we will address the question of indeterminism in standard quantum theory with respect to measurement processes. A priori, it is not clear whether the outcome of a measurement is determined by the initial quantum state of the measurement device. We disprove determinism in that sense by analyzing a correlated two-particle system in an initial spin singlet state and a measurement apparatus, which measures the spin of one of the particles.

The second part will investigate decoherence in the double slit experiment for a charged particle caused by an irradiated (monochromatic) laser wave. By calculating the decoherence parameter it will be shown that the laser wave destroys the interference pattern under certain conditions, namely a high laser intensity, long interaction time and a wavelength of the laser in the order of the slit distance. Our results and further quantum features also emphasize the non absoluteness of quantum events.

This talk is part of the CQIF Seminar series.

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