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Quantum technologies

Dieter Meschede's research group
Home Group members Yannik Völzke
Group members
M. Sc. Yannik Völzke
Last position
in our group:
Master student
Field of research
in our group:
Fibre cavity QED

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)arXivBibTeXPDF

    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 thesisBibTeXPDF
    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.