Erlangen 2018 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 7: Quantum Information (Quantum Computing)
Q 7.3: Talk
Monday, March 5, 2018, 11:15–11:30, K 1.020
Investigation of surface noise in high-temperature superconducting surface ion traps — •Philip Holz1, Kirill Lakhmanskiy1, Dominic Schärtl1, Muir Kumph2, Ben Ames1, Reouven Assouly1, Yves Colombe1, and Rainer Blatt1,3 — 1Institut für Experimentalphysik, Uni Innsbruck, Österreich — 2IBM, Thomas J. Watson Research Center, USA — 3Institut für Quantenoptik und Quanteninformation, Innsbruck, Österreich
Ion traps are a promising platform for quantum computation. One approach to scale up to larger numbers of qubits is to utilize microfaricated ion traps [1]. The close proximity of the ions to the trap surface leads, however, to an increase of the motional heating rate, which degrades the fidelity of quantum operations. The origin of this heating is not well understood [2]. Here we report on heating rate measurements performed in surface ion traps made of YBCO, a high-temperature superconductor. One trap is designed in such a way that Johnson noise is the dominant source of motional heating above the critical temperature Tc. By lowering the trap temperature below Tc we can directly compare Johnson noise with surface noise. Interestingly, for T<Tc the frequency scaling of the heating rate shows deviations from a simple power law behavior as predicted by so called two-level fluctuator models. In a second trap we observe a clear plateau in the temperature dependence of the heating rate for temperatures T>Tc, which has not been observed so far. [1] R. Blatt and D. Wineland, Nature 453, 1008 (2008) [2] M. Brownnutt et al., Rev. Mod. Phys. 87, 1419 (2015)