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Micromotion-enabled improvement of quantum logic gates with trapped ions / Markus Muller

New Journal of Physics

Swansea University Author: Muller, Markus

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Abstract

The micromotion of ion crystals confined in Paul traps is usually considered an inconvenient nuisance, and is thus typically minimised in high-precision experiments such as high-fidelity quantum gates for quantum infor- mation processing. In this work, we introduce a particular scheme where this beh...

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Published in: New Journal of Physics
Published:
Online Access: http://iopscience.iop.org/article/10.1088/1367-2630/aa86eb
URI: https://cronfa.swan.ac.uk/Record/cronfa36264
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Abstract: The micromotion of ion crystals confined in Paul traps is usually considered an inconvenient nuisance, and is thus typically minimised in high-precision experiments such as high-fidelity quantum gates for quantum infor- mation processing. In this work, we introduce a particular scheme where this behavior can be reversed, making micromotion beneficial for quantum information processing. We show that using laser-driven micromotion side- bands, it is possible to engineer state-dependent dipole forces with a reduced effect of off-resonant couplings to the carrier transition. This allows one, in a certain parameter regime, to devise entangling gate schemes based on geometric phase gates with both a higher speed and a lower error, which is attractive in light of current efforts towards fault-tolerant quantum information processing. We discuss the prospects of reaching the parameters required to observe this micromotion-enabled improvement in experiments with current and future trap designs.
Keywords: Quantum Computing, Trapped Ions, Quantum Optics, Micromotion, Entanglement
College: College of Science