Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Reversing Hydride Ion Formation in Quantum Information Experiments with
  Be$^+$   We demonstrate photodissociation of BeH$^+$ ions within a Coulomb crystal of
thousands of $^9$Be$^+$ ions confined in a Penning trap. Because BeH$^+$ ions
are created via exothermic reactions between trapped, laser-cooled
Be$^+$($^2\text{P}_{3/2}$) and background H$_2$ within the vacuum chamber, they
represent a major contaminant species responsible for infidelities in
large-scale trapped-ion quantum information experiments. The
rotational-state-insensitive dissociation scheme described here makes use of
157 nm photons to produce Be$^+$ and H as products, thereby restoring Be$^+$
ions without the need for reloading. This technique facilitates longer
experiment runtimes at a given background H$_2$ pressure, and may be adapted
for removal of MgH$^+$ and AlH$^+$ impurities.

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The categories of this paper are: plasm-ph
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The categories of this paper are: atom-ph
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The categories of this paper are: q-fin
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The categories of this paper are: dg-ga
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The categories of this paper are: math
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The categories of this paper are: ao-sci
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The categories of this paper are: acc-phys
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The categories of this paper are: patt-sol
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The categories of this paper are: eess
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The categories of this paper are: q-alg
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The categories of this paper are: hep-ex
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The categories of this paper are: gr-qc
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The categories of this paper are: adap-org
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The categories of this paper are: astro-ph
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The categories of this paper are: funct-an
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The categories of this paper are: econ