Set Membership with Two Classical and Quantum Bit Probes
International Colloquium on Automata, Languages and Programming (ICALP)(2022)
Abstract
We consider the following problem: Given a set S of at most n elements from a universe of size m, represent it in memory as a bit string so that membership queries of the form "Is x in S?" can be answered by making at most t probes into the bit string. Let s(m,n,t) be the minimum number of bits needed by any such scheme. We obtain new upper bounds for s(m,n,t=2), which match or improve all the previously known bounds. We also consider the quantum version of this problem and obtain improved upper bounds.
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Key words
quantum bit probes,set membership
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