= Quantum algorithm vs quantum gate vs quantum circuit
There is no fundamental difference between them, a <quantum algorithm> is a <quantum circuit>, which can be seen as a super complicated <quantum gate>.
Perhaps the greats practical difference is that algorithms tend to be defined for an arbitrary number of N qubits, i.e. as a <function> for that each N produces a specific <quantum circuit> with N <qubits> solving the problem. Most named gates on the other hand have fixed small sizes.
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