Quantum Computing Questions
The controlled-Fredkin gate, also known as the controlled-SWAP gate, is a three-qubit quantum gate that performs a controlled swap operation. It swaps the states of the second and third qubits if and only if the state of the first qubit is in the state |1⟩. If the first qubit is in the state |0⟩, then the second and third qubits remain unchanged. This gate is an important component in quantum computing circuits for implementing various algorithms and protocols.