description CNOT gate Overview
The Controlled-NOT (CNOT) gate is a fundamental two-qubit quantum logic gate that flips the target qubit's state based on the control qubit’s state, enabling entanglement and complex quantum computations.
help CNOT gate FAQ
What does a CNOT gate do?
A CNOT gate is a two-qubit quantum gate with one control qubit and one target qubit. It flips the target qubit only when the control qubit is in state 1.
Why is the CNOT gate important for entanglement?
A CNOT gate can entangle two qubits when the control qubit is placed in superposition first, often with a Hadamard gate. This pattern is used to create Bell states in many quantum computing examples.
Is CNOT a universal quantum gate by itself?
No. CNOT is not universal alone, but it becomes part of universal gate sets when combined with suitable single-qubit gates. Many circuit models use CNOT plus rotations or Clifford and T gates.
How is CNOT shown in quantum circuit diagrams?
The control is usually drawn as a filled dot, and the target is drawn as a circled plus symbol. A vertical line connects the two qubits in the circuit.
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