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Explicit Multiregister Measurements for Hidden Subgroup Problems

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arxiv quant-ph/0504067 v3 pith:QOS6W5VP submitted 2005-04-08 quant-ph

Explicit Multiregister Measurements for Hidden Subgroup Problems

classification quant-ph
keywords caseexplicitgraphhiddenisomorphismmeasurementregisterssome
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We present an explicit measurement in the Fourier basis that solves an important case of the Hidden Subgroup Problem, including the case to which Graph Isomorphism reduces. This entangled measurement uses $k=\log_2 |G|$ registers, and each of the $2^k$ subsets of the registers contributes some information. While this does not, in general, yield an efficient algorithm, it generalizes the relationship between Subset Sum and the HSP in the dihedral group, and sheds some light on how quantum algorithms for Graph Isomorphism might work.

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