Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum microwave-optical interface with nitrogen-vacancy centers in
  diamond   We propose an efficient scheme for a coherent quantum interface between
microwave and optical photons using nitrogen-vacancy (NV) centers in diamond.
In this setup, an NV center ensemble is simultaneously coupled to an optical
and a microwave cavity. We show that, by using the collective spin excitation
modes as an intermediary, quantum states can be transferred between the
microwave cavity and the optical cavity through either a double-swap scheme or
a dark-state protocol. This hybrid quantum interface may provide interesting
applications in single microwave photon detections or quantum information
processing.

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The categories of this paper are: hep-ex
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The categories of this paper are: q-bio
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The categories of this paper are: econ
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The categories of this paper are: astro-ph
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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: gr-qc
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The categories of this paper are: physics
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The categories of this paper are: adap-org
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The categories of this paper are: bayes-an
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The categories of this paper are: eess
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The categories of this paper are: supr-con
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The categories of this paper are: atom-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: alg-geom
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The categories of this paper are: acc-phys