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Existence of product vectors and their partial conjugates in a pair of spaces

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arxiv 1107.1023 v3 pith:AYD7GAXS submitted 2011-07-06 quant-ph math.OA

Existence of product vectors and their partial conjugates in a pair of spaces

classification quant-ph math.OA
keywords productthenexistpartialspacestherevectorcases
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Let $D$ and $E$ be subspaces of the tensor product of the $m$ and $n$ dimensional complex spaces, with codimensions $k$ and \ell$, respectively. We show that if $k+\ell<m+n-2$ then there must exist a product vector in $D$ whose partial conjugate lies in $E$. If $k+\ell >m+n-2$ then there may not exist such a product vector. If $k+\ell=m+n-2$ then both cases may occur depending on $k$ and $\ell$.

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