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Berlin 2014 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 16: Poster: Quantum information, micromechanical oscillators, matter wave optics, precision measurements and metrology

Q 16.31: Poster

Monday, March 17, 2014, 16:30–18:30, Spree-Palais

Quantum control of 9Be+ hyperfine qubits — •Sebastian Grondkowski1, Martina Carsjens1,2, Matthias Kohnen1,2, Timko Dubielzig1, and Christian Ospelkaus1,21Institut für Quantenoptik, Leibniz Universität Hannover, Welfengarten 1, 30167 Hannover, Germany — 2Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany

We describe the necessary control infrastructure for experiments with integrated microwave near-field surface-electrode ion traps with applications in quantum simulation and quantum logic. A trap geometry recently developed in our group [1] requires a static bias magnetic field, microwave control fields for single-qubit rotations and sideband transitions, dc voltages for trapping fields and reconfigurable rf trapping potentials.

Transistor amplifiers with preceding control stages on three rf trap electrodes are used to generate a reconfigurable rf trapping potential. In order to realize a field-independent 9Be+ qubit at 22.3 mT, we have designed a set of water-cooled magnetic field coils. The microwave currents are generated in FPGA controlled DDS-modules and pass a frequency multiplier and pulse shaping stage. We use fast DAC-modules [2] from NIST to generate arbitrary waveforms for the pulse shaper and also for the dc voltages in the trap.

[1] Applied Physics B - 10.1007/s00340-013-5689-6 (2013)

[2] Rev. Sci. Instrum. 84, 033108 (2013)

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