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Ion transport in an X-junction trap array

Brad Blakestad, National Institute of Standards and Technology

(Session : Thursday from )

Abstract. R.B. Blakestad, A.P. VanDevender, C. Ospelkaus, J.M. Amini, J. Britton, D. Leibfried, D.J. Wineland Key requirements for efficient large-scale quantum information processing (QIP) include reliable transport of information throughout the processor and the ability to perform gates between arbitrarily selected qubits. Trapped ions are a useful system for studying the elements of QIP and can potentially satisfy these requirements. For example, ions could be distributed over separate zones in an array, where information would be shared between zones by moving the ions [1]. Multidimensional arrays incorporating junctions would enable ions selected from arbitrary locations to be grouped together for multi-qubit gates. However, kinetic energy gained during transport would reduce computational fidelity and increase the duration required for ion recooling. Here, we report reliable transport of 9Be+ ions through an ``X-junction" trap array with low energy gain (< 10 quanta). We also examine two sources of energy gain during transport: a particular radio-frequency noise heating mechanism and digital sampling noise. * Supported by IARPA and the NIST Quantum Information Program [1] D. Kielpinski, C. Monroe and D.J. Wineland. Nature 417, 709 (2002)

Transport and heating in an X-junction ion trap array

Brad Blakestad, National Institute of Standards and Technology

(Session 5 : Friday from 5:00-7:00)

Abstract. Trapped ions are a useful system for studying the elements of quantum information processing. Simple algorithms have been demonstrated; but scaling to much larger tasks requires the ability to manipulate many qubits. To achieve this, ions could be distributed over separate trap zones in an array, where information would be shared between zones by moving the ions [1]. Multi-dimensional arrays incorporating junctions would allow arbitrary ions, selected from various locations, to be reliably grouped together for multi-qubit gates. Suppression of heating incurred during transport will minimize the time required for ion recooling. We report transport of Be+ ions through an ``X-junction" trap array with near unit probability and low heating (< 10 quanta). We demonstrate the preservation of qubit coherence during such transport. We also study a particular radio-frequency (RF) noise heating mechanism due to RF pseudopotential gradients, which are common in junction designs. * Supported by IARPA and the NIST Quantum Information Program [1] D. Kielpinski, C. Monroe and D.J. Wineland. Nature 417, 709 (2002)