Fabrication and Characterization of Semiconductor Ion Traps for QuantumInformation Processing.

Ion Trap;Quantum Computing;Physics;Science;Physics

Stick, Daniel LynnAnn Arbor ;

University of Michigan

关键词: Ion Trap;    Quantum Computing;    Physics;    Science;    Physics;   

Others  :  https://deepblue.lib.umich.edu/bitstream/handle/2027.42/55674/dstick_1.pdf?sequence=2&isAllowed=y

瑞士|英语

来源: The Illinois Digital Environment for Access to Learning and Scholarship

【 摘 要 】

The electromagnetic manipulation of isolated ions has led to many advances inatomic physics, from laser cooling to precision metrology and quantum control.As technical capability in this area has grown, so has interest in buildingminiature electromagnetic traps for the development of large-scale quantuminformation processors.This thesis will primarily focus on usingmicrofabrication techniques to build arrays of miniature ion traps, similar totechniques used in fabricating high component density microprocessors.Aspecific focus will be on research using a gallium arsenide/aluminum galliumarsenide heterostructure as a trap architecture, as well as the recent testingof different ion traps fabricated at outside foundries.The construction andcharacterization of a conventional ceramic trap capable of shuttling an ionthrough a junction will also be detailed, and reveal the need for movingtowards lithographically fabricated traps.Combined, these serve as a set ofproof-of-principle experiments pointing to methods for designing and buildinglarge scale arrays of ion traps capable of constituting a quantum informationprocessor.As traps become smaller, electrical potentials on the electrodes have greaterinfluence on the ion.This not only pertains to intentionally appliedvoltages, but also to deleterious noise sources, such as thermal Johnson noiseand the more significant ``patch potential;; noise, which both cause motionalheating of the ion.These problematic noise sources dovetail with my thesisresearch into trap miniaturization since their effects become more pronouncedand impossible to ignore for small trap sizes.Therefore characterizing themand investigating ways to suppress them have become an important component ofmy research.I will describe an experiment using a pair of movable needleelectrodes to measure the ion heating rate corresponding to the harmonicfrequency of the trap, the ion-electrode distance, and the electrodetemperature.This information is used for characterizing the fluctuatingpotentials and exploring the possibility of suppressing motional heating bycooling the trap electrodes.This source of noise is also observed in othersystems, and its characterization could potentially improve other precisionexperiments, such as those measuring deviations in the gravitational inversesquare law with proximate masses.