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Quantum Information Processing

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01-05-2021

Efficient sympathetic cooling in mixed barium and ytterbium ion chains

Authors: Tomasz P. Sakrejda, Liudmila A. Zhukas, Boris B. Blinov

Published in: Quantum Information Processing | Issue 5/2021

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Abstract

We study sympathetic cooling of the radial ion motion in a linear RF trap in mixed barium-ytterbium chains. Barium ions are Doppler-cooled, while ytterbium ions are cooled through their interaction with cold barium ions. We estimate the efficiency of sympathetic cooling by measuring the average occupation quantum numbers, and thus the temperature, of all radial normal modes of motion in the ion chain. The full set of orderings in a chain of two barium and two ytterbium ions have been probed, and we show that the average thermal occupation numbers for all chain configurations strongly depend on the trap aspect ratio. We demonstrate efficient sympathetic cooling of all radial normal modes for the trap aspect ratio of approximately 2.9.

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Title: Efficient sympathetic cooling in mixed barium and ytterbium ion chains
Authors: Tomasz P. Sakrejda
Liudmila A. Zhukas
Boris B. Blinov
Publication date: 01-05-2021
Publisher: Springer US
Published in: Quantum Information Processing / Issue 5/2021
Print ISSN: 1570-0755
Electronic ISSN: 1573-1332
DOI: https://doi.org/10.1007/s11128-021-03112-1

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