A probability is always positive (or zero) and real, but an amplitude can be positive, negative, or even complex (if you don't know what a complex number is, don't worry). This changes everything.

Instead, each path contributes what we call a probability amplitude to the entire A-B journey. Schrodinger's wave function and Feynman's path integral describe this probability amplitude thing.

These waves have all the same properties of water waves, but the amplitude, or height of the wave, is a probability amplitude. This amplitude can be negative, which probably seems a little strange.

How we learn is a quantum-like manner! University of Science and Technology of China. Journal Nature Human Behaviour DOI 10.1038/s41562-019-0804-2 ...

Such an interpretation treats the wave function merely as a complex probability amplitude used to calculate the probability of finding the quantum object at a given place.

Quantum mechanics says not merely that the world is probabilistic, but that it uses rules of probability that no science fiction writer would have had the imagination to invent. These rules ...

We mapped the excitation probability as a function of (Δt, φ) for a large number of molecules, and found a rich variety of coherent dynamics. Four examples are shown in Fig. 4a–d .

Quantum computers are what some would call an emerging technology. They aren’t useful for much just yet, but in the future they might model molecules for drug discovery, break public-key ...

Amplitude amplification enhances the probability amplitude of specific quantum states, ensuring that when the results are combined, they accurately reflect the original circuit's computation.