Surface-electrode ion trap with integrated light source

Abstract

An atomic ion is trapped at the tip of a single-mode optical fiber in a cryogenic (8 K) surface-electrode ion trap. The fiber serves as an integrated source of laser light, which drives the quadrupole qubit transition of ${}^{88}$Sr${}^{+}$. Through \emph{in situ} translation of the nodal point of the trapping field, the Gaussian beam profile of the fiber output is imaged, and the fiber-ion displacement, in units of the mode waist at the ion, is optimized to within $0.13\pm 0.10$ of the mode center despite an initial offset of $3.30\pm 0.10$. Fiber-induced charging at $125\mu$W is observed to be $\sim 10$ V/m at an ion height of $670\mu$m, with charging and discharging time constants of $1.6\pm 0.3$ s and $4.7\pm 0.6$ s respectively. This work is of importance to large-scale, ion-based quantum information processing, where optics integration in surface-electrode designs may be a crucial enabling technology.

4 pages, 4 figures

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• An Integrated Mirror and Surface Ion Trap with a Tunable Trap Location
• Topological Phenomena in Trapped Ion Systems
• Electric Vector Potential Approach in Electrostatics: The Surface Electrode
• An ion trap built with photonic crystal fibre technology
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• A Fully Fiber-Integrated Ion Trap for Portable Optical Atomic Clocks
• Surface-electrode trap with an integrated permanent magnet for generating a magnetic-field gradient at trapped ions
• Expansion Formula For the Magnetic Field of a Periodically Deformed Circular Current Loop
• Compatibility of trapped ions and dielectrics at cryogenic temperatures