Terminology
Superposition
A property of quantum systems where they can exist in multiple different states simultaneously until they are observed. Imagine a spinning coin—while it spins, it isn't just heads or tails; it's a blur of both.
Oracle (Phase Flip)
A theoretical black box function in a quantum computer that can recognize a correct answer. It doesn't tell you where the answer is, it just acts as a definitive 'Yes' or 'No' checker. In Amplitude Amplification, it flips the mathematical sign (phase) of the correct answer.
Amplitude
The 'size' or 'loudness' of a specific quantum state's wave. Squaring the amplitude gives you the probability of actually finding the system in that state when you finally measure it.
Interference
Waves can add together to grow larger (constructive) or cancel each other out (destructive). Quantum algorithms use interference to shrink the amplitudes of wrong answers and grow the amplitude of the right answer.
State Vector
An arrow in a mathematical space that points to the current probability of all possible answers. Rotating this arrow closer to the 'Good' axis increases your chance of getting the right answer.
Phase Kickback
A quantum math trick where the Oracle flips the sign (from positive to negative) of the amplitude belonging to the correct answer. This negative sign flags the answer so the algorithm can amplify it later.