Note on Needle in a Haystack

Details Note on Needle in a Haystack Note on Needle in a Haystack

2003-08-28

arxiv.org/abs/cs/0308043v2

Computer Science

Emerging Technologies

Edited and clarified; upgraded statements about use of Grover's quantum algorithm

Scientific paper

Introduced below is a quantum database method, not only for retrieval but also for creation. It uses a particular structure of true's and false's in a state vector of n qubits, permitting up to 2**2**n words, vastly more than for classical bits. Several copies are produced so that later they can be destructively observed and a word determined with high probability. Grover's algorithm is proposed below to read out, nondestructively the unknown contents of a given stored state vector using only one state vector.

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