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Q: Fachverband Quantenoptik und Photonik

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

Q 16.14: Poster

Montag, 17. März 2014, 16:30–18:30, Spree-Palais

Characterisation of ion heating in a cryogenic ion-trap system — •Michael Niedermayr¹, Kirill Lakhmanskiy¹, Muir Kumph¹, Stefan Partel², Johannes Edlinger², Michael Brownnutt¹, and Rainer Blatt¹ — ¹Institut für Experimentalphysik, Universität Innsbruck, Technikerstr. 25, 6020 Innsbruck, Austria — ²Forschungszentrum Mikrotechnik, FH Vorarlberg, Hochschulstr. 1, Dornbirn, Austria

One promising approach to scalable quantum-information-processing architectures is based on miniaturised surface ion traps. At present, one significant limitation to miniaturisation is set by the rate at which ions are heated, which is predominately caused by electric-field noise at the ions’ resonant frequencies and increases as the ions approach the trap surface. The mechanism of this heating is not yet fully understood, but various sources for the field noise have been identified, such as surface contamination and technical noise. We present heating-rate measurements performed on single ⁴⁰Ca⁺ ions confined in surface traps with an ion-electrode separation of 230 µm. The traps were operated at cryogenic temperatures to reduce the ion’s heating rate and improve the trap’s material properties. The heating was characterised for a number of configurations of the filtering electronics and for different trap fabrication methods. The results contribute to an improved understanding of electric-filed-noise sources in cryogenic ion traps.