Yannik Völzke

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Yannik Völzke

People - Fibre cavity QED

M. Sc. Yannik Völzke

Last position
in our group:

Master student

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Publications(up to 2017)

M. Martinez-Dorantes, W. Alt, J. Gallego, S. Ghosh, L. Ratschbacher, Y. Völzke and D. Meschede
Fast Nondestructive Parallel Readout of Neutral Atom Registers in Optical Potentials, Phys. Rev. Lett. 119, 180503 (2017)arXiv BibTeX
ABSTRACT »
We demonstrate the parallel and nondestructive readout of the hyperfine state for optically trapped ⁸⁷Rb atoms. The scheme is based on state-selective fluorescence imaging and achieves detection fidelities > 98% within 10 ms, while keeping 99% of the atoms trapped. For the readout of dense arrays of neutral atoms in optical lattices, where the fluorescence images of neighboring atoms overlap, we apply a novel image analysis technique using Bayesian inference to determine the internal state of multiple atoms. Our method is scalable to large neutral atom registers relevant for future quantum information processing tasks requiring fast and nondestructive readout and can also be used for the simultaneous readout of quantum information stored in internal qubit states and in the atoms’ positions.

Y. Völzke
Simultaneous Non-Destructive State Detection of Neutral Atoms, (2014), Master thesisBibTeX
ABSTRACT »
The present work investigates a non-destructive hyperfine state detection method for neutral atoms in an one dimensional optical lattice. The atoms are exposed to near resonant light and from their fluorescence image their internal state can be extracted. Additionally a compression method is presented to densify an atomic ensemble in this trap. Chapter 1 presents the experimental setup for trapping a small atomic ensemble in an one dimensional lattice. Chapter 2 focuses on the compression sequence and its effciency. Chapter 3 is devoted to the state detection of well separated individual atoms. It provides detailed studies of the imaging system and the state dependent imaging is investigated experimentally and theoretically. In chapter 4 a Bayesian analysis of the fluorescence images is used to improve the state detection fidelity. In chapter 5 the state detection is performed for groups of atoms that cannot be individually resolved. For two atoms this is done experimentally and the many atom case is simulated to compare different analysis methods. Finally, chapter 6 summarizes the results of this thesis and gives a short outlook.