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arXiv · 1211.6554

Microwave Near-Field Quantum Control of Trapped Ions

U. Warring·C. Ospelkaus·Y. Colombe·K. R. Brown·J. M. Amini·M. Carsjens·D. Leibfried·D. J. Wineland
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Abstract

Microwave near-field quantum control of spin and motional degrees of freedom of 25Mg+ ions can be used to generate two-ion entanglement, as recently demonstrated in Ospelkaus et al. [Nature 476, 181 (2011)]. Here, we describe additional details of the setup and calibration procedures for these experiments. We discuss the design and characteristics of the surface-electrode trap and the microwave system, and compare experimental measurements of the microwave near-fields with numerical simulations. Additionally, we present a method that utilizes oscillating magnetic-field gradients to detect micromotion induced by the ponderomotive radio-frequency potential in linear traps. Finally, we discuss the present limitations of microwave-driven two-ion entangling gates in our system.

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U. Warring, C. Ospelkaus, Y. Colombe, K. R. Brown, J. M. Amini, M. Carsjens, D. Leibfried, D. J. Wineland. 2012-11-28. Microwave Near-Field Quantum Control of Trapped Ions. https://doi.org/10.1103/physreva.87.013437

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