What does a SWAP gate do?

Question: What does a SWAP gate do? A) Exchanges the quantum states of two qubits B) Measures two qubits and stores the result C) Creates a new qubit from a classical bit D) Removes phase from a circuit Correct: A Explanation: A SWAP gate exchanges the states of two qubits. It is especially useful when routing circuits on hardware where only certain qubits are directly connected. Topic: quantum computing / SWAP gate / routing