Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Multi-GHz repetition rate, multi-watt average power, ultraviolet laser
  pulses for fast trapped-ion entanglement operations   The conventional approach to perform two-qubit gate operations in trapped
ions relies on exciting the ions on motional sidebands with laser light, which
is an inherently slow process. One way to implement a fast entangling gate
protocol requires a suitable pulsed laser to increase the gate speed by orders
of magnitude. However, the realization of such a fast entangling gate operation
presents a big technical challenge, as such the required laser source is not
available off-the-shelf. For this, we have engineered an ultrafast entangling
gate source based on a frequency comb. The source generates bursts of several
hundred mode-locked pulses with pulse energy $\sim$800 pJ at 5 GHz repetition
rate at 393.3 nm and complies with all requirements for implementing a fast
two-qubit gate operation. Using a single, chirped ultraviolet pulse, we
demonstrate a rapid adiabatic passage in a Ca$^+$ ion. To verify the
applicability and projected performance of the laser system for inducing
entangling gates we run simulations based on our source parameters. The gate
time can be faster than a trap period with an error approaching $10^{-4}$.

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The categories of this paper are: hep-th
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The categories of this paper are: hep-lat
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The categories of this paper are: comp-gas
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The categories of this paper are: solv-int
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The categories of this paper are: bayes-an
36
The categories of this paper are: cmp-lg
33
The categories of this paper are: plasm-ph
0
The categories of this paper are: hep-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: patt-sol
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The categories of this paper are: ao-sci
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The categories of this paper are: astro-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: q-fin
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The categories of this paper are: chem-ph
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The categories of this paper are: mtrl-th