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Lower Bounds on Quantum Query Complexity

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arxiv quant-ph/0509153 v1 pith:6O6425HP submitted 2005-09-21 quant-ph

Lower Bounds on Quantum Query Complexity

classification quant-ph
keywords quantumboundscomputationalcomputersloweralgorithmscannotcertain
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Shor's and Grover's famous quantum algorithms for factoring and searching show that quantum computers can solve certain computational problems significantly faster than any classical computer. We discuss here what quantum computers_cannot_ do, and specifically how to prove limits on their computational power. We cover the main known techniques for proving lower bounds, and exemplify and compare the methods.

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