Common
Toffoli gate
Universal reversible logic gate, applied in quantum computing
Toffoli gate
In logic circuits, the Toffoli gate, also known as the CCNOT gate ("controlled-controlled-not"), invented by Tommaso Toffoli in 1980 is a CNOT gate with two control bits and one target bit. That is, the target bit (third bit) will be inverted if and only if the first and second bits are both 1. It is a universal reversible logic gate, which means that any classical reversible circuit can be constructed from Toffoli gates. There is also a quantum-computing version where the bits are replaced by qubits.
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