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An on-chip toolset for surface-electrode trap based quantum processors

True Merrill, Georgia Tech Research Institute

(Session 1 : Thursday from 9:45am - 10:15am)

Increasing the size and complexity of ion-trap quantum computing experiments requires improvements in automation, hardware, and control.  We report on several technologies which incorporate control electronics, diffractive ion imaging optics, and quantum control techniques for microwave gates in microfabricated surface-traps.  We demonstrate a compact, in-vacuum 80 channel digital-to-analog converter (DAC) system controlling a surface-electrode trap.  The DAC system transports  40Ca+ ions for over 70 m at 1 m/s without cooling, and the measured 0.8 quanta/ms  ion-heating rate is comparable to external DAC systems.  A second project incorporates diffractive Fresnel mirrors onto a trap surface for enhanced ion imaging and state detection.  Optics for light collimation and refocusing are demonstrated, achieving a ~8.3 x enhancement in the total fluorescence signal.  We comment on possible limits to asynchronous ion-qubit readout and strategies to mitigate decoherence from stray photons during measurement processes. Finally, we discuss composite pulse techniques for gates on 171Yb+ qubits that yield accurate quantum control despite classical control errors.