What is the controlled-controlled-controlled-phase gate?

What is the controlled-controlled-controlled-phase gate?

The controlled-controlled-controlled-phase gate, also known as the Toffoli gate or the CCNOT gate, is a three-qubit gate in quantum computing. It performs a controlled operation on the third qubit (target qubit) based on the states of the first two qubits (control qubits). If both control qubits are in the state |1⟩, it applies a phase shift of π to the target qubit. Otherwise, it leaves the target qubit unchanged. This gate is commonly used in quantum algorithms and quantum error correction protocols.