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What is fidelity in quantum computing?

"What is the real meaning of 'Fidelity' (As I searched, it is reliablity of thing)?" Since "fidelity" means "reliability of a thing" in everyday (not necessarily quantum)...
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How to calculate the average fidelity of Pauli error channel

TL;DR: Two steps. First, we find the entanglement fidelity $F_e(\mathcal{P}_{p_x,p_y,p_z})=1-(p_x+p_y+p_z)$. Next, we use Horodecki's formula that connects the average and entanglement fidelities $$ \...
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