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A new quantum lower bound method, with an application to strong direct product theorem for quantum search

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arxiv quant-ph/0508200 v2 pith:RQSPGAMO submitted 2005-08-26 quant-ph cs.CC

classification quant-phcs.CC
keywords methodquantumadversarydirectlowerproductsearchstrong
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We present a new method for proving lower bounds on quantum query algorithms. The new method is an extension of adversary method, by analyzing the eigenspace structure of the problem. Using the new method, we prove a strong direct product theorem for quantum search. This result was previously proven by Klauck, Spalek and de Wolf (quant-ph/0402123) using polynomials method. No proof using adversary method was known before.

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  1. The Compressed Oracle is a Worthy (Multiplicative) Adversary

    quant-ph 2025-09 conditional novelty 6.0 of 10

    The compressed oracle technique is captured by the multiplicative adversary method through the new multiplicative ladder adversary method, up to a factor of 6.

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