What is the CNOT gate?

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What is the CNOT gate?

The CNOT gate, also known as the Controlled-NOT gate, is a fundamental two-qubit gate in quantum computing. It operates on two qubits, one control qubit and one target qubit. The CNOT gate flips the state of the target qubit if and only if the control qubit is in the state |1⟩. If the control qubit is in the state |0⟩, the target qubit remains unchanged. The CNOT gate is widely used in quantum algorithms and quantum error correction codes.