Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dual-Species, Multi-Qubit Logic Primitives for Ca+/Sr+ Trapped-Ion
  Crystals   We demonstrate key multi-qubit quantum logic primitives in a dual-species
trapped-ion system based on $^{40}$Ca+ and $^{88}$Sr+ ions, using two optical
qubits with quantum-logic-control frequencies in the red to near-infrared
range. With all ionization, cooling, and control wavelengths in a wavelength
band similar for the two species and centered in the visible, and with a
favorable mass ratio for sympathetic cooling, this pair is a promising
candidate for scalable quantum information processing. Same-species and
dual-species two-qubit gates, based on the Moelmer-Soerensen interaction and
performed in a cryogenic surface-electrode trap, are characterized via the
fidelity of generated entangled states; we achieve fidelities of 98.8(2)% and
97.5(2)% in Ca+ - Ca+ and Sr+ - Sr+ gates, respectively. For a similar Ca+ -
Sr+ gate, we achieve a fidelity of 94.3(3)%, and carrying out a Sr+ - Sr+ gate
performed with a Ca+ sympathetic cooling ion in a Sr+ - Ca+ - Sr+ crystal
configuration, we achieve a fidelity of 95.7(3)%. These primitives form a set
of trapped-ion capabilities for logic with sympathetic cooling and ancilla
readout or state transfer for general quantum computing and communication
applications.

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The categories of this paper are: hep-ph
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The categories of this paper are: econ
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The categories of this paper are: adap-org
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The categories of this paper are: math-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: alg-geom
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The categories of this paper are: patt-sol
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The categories of this paper are: stat
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The categories of this paper are: atom-ph
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The categories of this paper are: plasm-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: nucl-ex
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The categories of this paper are: eess
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The categories of this paper are: math
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The categories of this paper are: dg-ga
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The categories of this paper are: nucl-th