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This is help from lectures on quantum computing that I missed due to illness and now my professor is away.

1) Can anyone help me on what a function gate is and its matrix representation?

I realise that the function is not something like x^2 but something that takes a value from 0 or 1, but other than that I really don't understand, can anyone give me examples say for f(0)=1 or f(1)=0?

2) Can this matrix representation have any kind of circuit diagram feature?

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# Quantum Computing help

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