Ultrafast Control of Spin and Motion in Trapped Ions

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dc.contributor.advisorMonroe, Christopher Ren_US
dc.contributor.authorMizrahi, Jonathan Alberten_US
dc.contributor.departmentPhysicsen_US
dc.contributor.publisherDigital Repository at the University of Marylanden_US
dc.contributor.publisherUniversity of Maryland (College Park, Md.)en_US
dc.date.accessioned2014-10-11T05:30:27Z
dc.date.available2014-10-11T05:30:27Z
dc.date.issued2013en_US
dc.description.abstractTrapped atomic ions are a promising medium for quantum computing, due to their long coherence times and potential for scalability. Current methods of entangling ions rely on addressing individual modes of motion within the trap and applying qubit state dependent forces with external fields. This approach can limit the speed of entangling gates and make them vulnerable to decoherence due to coupling to unwanted modes or ion heating. This thesis is directed towards demonstrating novel entanglement schemes which are not limited by the trap frequency, and can be made almost arbitrarily fast. Towards this goal, I report here on the first experiments using ultrafast laser pulses to control the internal and external states of a single trapped ion. I begin with experiments in ultrafast spin control, showing how a single laser pulse can be used to completely control both spin degrees of freedom of the ion qubit in tens of picoseconds. I also show how a train of weak pulses can be used to drive Raman transitions based on a frequency comb. I then discuss experiments using pulses to rapidly entangle the spin with the motion, and how careful spectral redistribution allows a single pulse to execute a spin-dependent momentum kick. Finally, I explain how these spin-dependent momentum kicks can be used in the future to create an ultrafast entangling gate. I go over how such a gate would work, and present experimentally realizable timing sequences which would create a maximally entangled state of two ions in a time faster than the period of motion in the trap.en_US
dc.identifierhttps://doi.org/10.13016/M2959K
dc.identifier.urihttp://hdl.handle.net/1903/15661
dc.language.isoenen_US
dc.subject.pqcontrolledAtomic physicsen_US
dc.subject.pqcontrolledQuantum physicsen_US
dc.subject.pquncontrolledGateen_US
dc.subject.pquncontrolledIonsen_US
dc.subject.pquncontrolledLaseren_US
dc.subject.pquncontrolledPulseden_US
dc.subject.pquncontrolledQuantumen_US
dc.subject.pquncontrolledUltrafasten_US
dc.titleUltrafast Control of Spin and Motion in Trapped Ionsen_US
dc.typeDissertationen_US

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