Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Conditional purity and quantum correlation measures in two qubit mixed
  states   We analyze and show experimental results of the conditional purity, the
quantum discord and other related measures of quantum correlation in mixed
two-qubit states constructed from a pair of photons in identical polarization
states. The considered states are relevant for the description of spin pair
states in interacting spin chains in a transverse magnetic field. We derive
clean analytical expressions for the conditional local purity and other
correlation measures obtained as a result of a remote local projective
measurement, which are fully verified by the experimental results. A simple
exact expression for the quantum discord of these states in terms of the
maximum conditional purity is also derived.

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The categories of this paper are: cond-mat
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The categories of this paper are: nlin
27
The categories of this paper are: comp-gas
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The categories of this paper are: gr-qc
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The categories of this paper are: plasm-ph
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The categories of this paper are: math
37
The categories of this paper are: supr-con
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The categories of this paper are: cs
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The categories of this paper are: dg-ga
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The categories of this paper are: stat
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The categories of this paper are: astro-ph
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The categories of this paper are: physics
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The categories of this paper are: math-ph
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The categories of this paper are: q-bio
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The categories of this paper are: chao-dyn
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The categories of this paper are: adap-org