Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Rapid high-fidelity spin state readout in Si/SiGe quantum dots via
  radio-frequency reflectometry   Silicon spin qubits show great promise as a scalable qubit platform for
fault-tolerant quantum computing. However, fast high-fidelity readout of charge
and spin states, which is required for quantum error correction, has remained
elusive. Radio-frequency reflectometry enables rapid high-fidelity readout of
GaAs spin qubits, but the relatively large resistances and capacitances of
accumulation-mode Si quantum dot devices have made radio-frequency
reflectometry challenging in these platforms. In this work, we implement
radio-frequency reflectometry in a Si/SiGe quantum dot device with overlapping
gates by making minor device-level changes that eliminate these challenges. We
demonstrate charge state readout with a fidelity above 99.9% in an integration
time of 300 ns. We measure the singlet and triplet states of a double quantum
dot via both conventional Pauli spin blockade and a charge latching mechanism,
and we achieve maximum fidelities of 82.9% and 99.0% in 2.08 $\mu$s and 1.6
$\mu$s integration times, respectively. We also use radio-frequency
reflectometry to perform single-shot readout of single-spin states via
spin-selective tunneling in microsecond-scale integration times.

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The categories of this paper are: chem-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: funct-an
16
The categories of this paper are: stat
13
The categories of this paper are: quant-ph
9
The categories of this paper are: nlin
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The categories of this paper are: patt-sol
12
The categories of this paper are: nucl-th
5
The categories of this paper are: gr-qc
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The categories of this paper are: nucl-ex
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The categories of this paper are: dg-ga
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The categories of this paper are: solv-int
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The categories of this paper are: chao-dyn
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The categories of this paper are: adap-org
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The categories of this paper are: supr-con
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The categories of this paper are: cmp-lg