Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Evaluating the Eavesdropper Entropy via Bloch-Messiah Decomposition   We explore the Bloch-Messiah decomposition of Gaussian unitary to analyze the
Entangling Cloner Attack performed by an eavesdropper on a discrete modulated
continuous variable QKD scenario. Such a decomposition allows to replace the
nonlinear unitary resulting from eavesdropping and tracing out Bob's mode into
an architecture of single-mode operations (squeezers, phase shifters and
displacements) and a two-mode beam splitter. Based on such architecture we were
able to get tighter upper bounds to the eavesdropper entropy for a discrete
modulated CVQKD scheme. The new bounds are justified from the Gaussian
extremality property valid for entangled-based equivalent protocols.

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The categories of this paper are: acc-phys
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The categories of this paper are: nucl-th
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The categories of this paper are: q-bio
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The categories of this paper are: nucl-ex
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The categories of this paper are: physics
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The categories of this paper are: plasm-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: hep-ex
0
The categories of this paper are: hep-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: hep-lat
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The categories of this paper are: cond-mat
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The categories of this paper are: gr-qc
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The categories of this paper are: adap-org
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The categories of this paper are: cs
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The categories of this paper are: cmp-lg