Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Multiplexed quantum repeaters based on dual-species trapped-ion systems   Trapped ions form an advanced technology platform for quantum information
processing with long qubit coherence times, high-fidelity quantum logic gates,
optically active qubits, and a potential to scale up in size while preserving a
high level of connectivity between qubits. These traits make them attractive
not only for quantum computing but also for quantum networking. Dedicated,
special-purpose trapped-ion processors in conjunction with suitable
interconnecting hardware can be used to form quantum repeaters that enable
high-rate quantum communications between distant trapped-ion quantum computers
in a network. In this regard, hybrid traps with two distinct species of ions,
where one ion species can generate ion-photon entanglement that is useful for
optically interfacing with the network and the other has long memory lifetimes,
useful for qubit storage, have been proposed for entanglement distribution. We
consider an architecture for a repeater based on such dual-species trapped-ion
systems. We propose and analyze a protocol based on spatial and temporal mode
multiplexing for entanglement distribution across a line network of such
repeaters. Our protocol offers enhanced rates compared to rates previously
reported for such repeaters. We determine the ion resources required at the
repeaters to attain the enhanced rates, and the best rates attainable when
constraints are placed on the number of repeaters and the number of ions per
repeater. Our results bolster the case for near-term trapped-ion systems as
quantum repeaters for long-distance quantum communications.

18
The categories of this paper are: econ
5
The categories of this paper are: gr-qc
9
The categories of this paper are: nlin
29
The categories of this paper are: funct-an
22
The categories of this paper are: chao-dyn
35
The categories of this paper are: mtrl-th
3
The categories of this paper are: physics
7
The categories of this paper are: hep-th
14
The categories of this paper are: math-ph
32
The categories of this paper are: atom-ph
31
The categories of this paper are: ao-sci
24
The categories of this paper are: dg-ga
1
The categories of this paper are: cs
17
The categories of this paper are: q-fin
2
The categories of this paper are: math
20
The categories of this paper are: acc-phys