Reference · 1997

Quantum mechanics helps in searching for a needle in a haystack

Grover, L. K. (1997). Quantum mechanics helps in searching for a needle in a haystack. Physical Review Letters, 79(2), 325–328.

DOI Record link

Authors: Lov K. Grover
Venue: Physical Review Letters 79(2), 325–328

The short Physical Review Letters account, including the unsorted phone-book illustration. This library uses it as intuition for an oracle, and says explicitly that the illustration is not a proposal to load a classical database entry by entry.

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Grover's algorithmalgorithm

Updated 7 Oct 2026.