Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Off-diagonal mixed state phases in unitary evolution   Off-diagonal mixed state phases based upon a concept of orthogonality adapted
to unitary evolution and a proper normalisation condition are introduced. Some
particular instances are analysed and parallel transport leading to the
off-diagonal mixed state geometric phase is delineated. A complete experimental
realisation of the off-diagonal mixed state geometric phases in the qubit case
using polarisation-entangled two-photon interferometry is proposed.

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The categories of this paper are: nlin
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The categories of this paper are: econ
27
The categories of this paper are: comp-gas
5
The categories of this paper are: gr-qc
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The categories of this paper are: q-fin
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The categories of this paper are: stat
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The categories of this paper are: physics
1
The categories of this paper are: cs
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The categories of this paper are: solv-int
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The categories of this paper are: patt-sol
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The categories of this paper are: q-alg
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The categories of this paper are: plasm-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: adap-org
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The categories of this paper are: alg-geom