Amplitude amplification

Amplitude amplification is a technique in quantum computing which generalizes the idea behind Grover's search algorithm, and gives rise to a family of quantum algorithms. It was discovered by Gilles Brassard and Peter Høyer in 1997, and independently rediscovered by Lov Grover in 1998.

In a quantum computer, amplitude amplification can be used to obtain a quadratic speedup over several classical algorithms.