Quantentechnologie

This master thesis contains two major parts. On the theoretical side simulating the state-dependent transport of neutral caesium atoms in a two-dimensional optical lattice gives an intuitive picture of the state-dependent potential during transport. The more practical part deals with the task to load the atoms into the lattice since they cannot be trapped directly in the plane of the experiment. A magneto-optical trap in a distance of about ∼2 mm below the lattice traps atoms out of the vacuum background and lift them afterwards into the lattice. This is realised using a precise electronic control of the imbalance of current guided through the two coils for building up the required quadrupole field by diverting a certain amount of current around one coil. Analysis of the step-response signal of the used metal band coils yields mandatory characteristics for achieving a fast and stable control. A galvanic isolated signal transfer protects the computer control against damage due to accidental voltage pulses from the high-power system. The diverted current can change with ∼0.9 A ms⁻¹.