Hannover 2016 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 47: Quantum Information: Quantum Computing and Communication I

Q 47.8: Vortrag

Donnerstag, 3. März 2016, 12:45–13:00, e214

Quantum Information Processing with Segmented Ion Traps — •Ulrich Poschinger, Thomas Ruster, Henning Kaufmann, Vidyut Kaushal, Jonas Schulz, Christian Schmiegelow, and Ferdinand Schmidt-Kaler — QUANTUM, Universität Mainz

Segmented ion traps offer the possibility to scale up quantum information processing with trapped ion quantum bits via local coherent manipulation of small ion crystals and shuttling of ions within the trap structure. This enables novel schemes for quantum computing, simulation, communication and sensing. We briefly review the current state-of-the-art of the required technology and methods. Our approach to scalability requires ion shuttling operations which do not affect the fidelity of entangling gates. This in turn requires either slow operation times or a substantial control overhead[1,2]. We show how to circumvent this by carrying out entangling gates on radial motional modes of vibration, which are not excited throughout shuttling operations. Furthermore, we demonstrate how entangled ions in conjunction with shuttling operations can be used for sensing inhomogeneous magnetic fields, with nanometer resolution in position and pT field resultion. Finally, we show how shuttling operations can be harnessed to lock the ion position to an optical free-space standing wave [3], which allows for the realization of phase-controlled spin-dependent optical forces. Additional applications of this technique include precise mapping of electric trap potentials and improved addressing of qubit registers.

[1] H. Kaufmann et al., NJP 16, 073012 (2014) [2] T. Ruster et al., PRA 90, 033410 (2014) [3] C. Schmiegelow et al., arXiv:1507.05207