Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum Disentanglement Eraser: an optical implementation using
  three-photon spontaneous decay   The 'disentanglement eraser' or 'entanglement restorer' scheme allows
retrieving entanglement by erasing the information about the formation of a
classical (or separable) state. It suggests an analogy between the pairs of
properties: entangled-separable and wave-particle, the latter as described in
the 'quantum eraser'. The scheme illustrates the physical importance of
information in quantum systems, and it is also useful as a building block for
quantum computation. An optical setup for its simple implementation using
three-photon decay in a centro-symmetrical crystal is proposed.

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The categories of this paper are: dg-ga
33
The categories of this paper are: plasm-ph
0
The categories of this paper are: hep-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: acc-phys
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The categories of this paper are: eess
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The categories of this paper are: econ
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The categories of this paper are: adap-org
31
The categories of this paper are: ao-sci
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The categories of this paper are: bayes-an
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The categories of this paper are: stat
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The categories of this paper are: alg-geom
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The categories of this paper are: cond-mat
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The categories of this paper are: cmp-lg
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The categories of this paper are: hep-lat
12
The categories of this paper are: nucl-th