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Probabilistic implementation of universal Hadamard and Unitary gates

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arxiv quant-ph/0404141 v2 pith:ENOLWDBO submitted 2004-04-25 quant-ph

Probabilistic implementation of universal Hadamard and Unitary gates

classification quant-ph
keywords unitarygateshadamardbestchosenderiveefficienciesevolution
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We show that the Hadamard and Unitary gates could be implemented by a unitary evolution together with a measurement for any unknown state chosen from a set $A = {{| {\Psi_i} > ,| {\bar {\Psi}_i} >}}({i = 1,2})$ if and only if $| {\Psi_1} > ,| {\Psi_2} > ,| {\bar {\Psi}_1} > ,| {\bar {\Psi}_2} >$ are linearly independent. We also derive the best transformation efficiencies.

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