Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Cavity-enhanced optical readout of a single solid-state spin   We demonstrate optical readout of a single electron spin using cavity quantum
electrodynamics. The spin is trapped in a single quantum dot that is strongly
coupled to a nanophotonic cavity. Selectively coupling one of the optical
transitions of the quantum dot to the cavity mode results in a spin-dependent
cavity reflectivity that enables projective spin measurements by monitoring the
reflected intensity of an incident optical field. Using this approach, we
demonstrate spin readout fidelity of 0.61 for a quantum dot that has a poor
branching ratio of 0.43. Achieving this fidelity using resonance fluorescence
from a bare dot would require 43 times improvement in photon collection
efficiency.

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The categories of this paper are: astro-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: dg-ga
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The categories of this paper are: q-bio
35
The categories of this paper are: mtrl-th
23
The categories of this paper are: solv-int
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The categories of this paper are: chem-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: patt-sol
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The categories of this paper are: hep-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: plasm-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: q-alg
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The categories of this paper are: gr-qc
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The categories of this paper are: econ