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Quantum Computing in Practice with Qiskit® and IBM Quantum Experience®
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In addition to the single-qubit and two-qubit gates, Qiskit® also supports 3- and more qubit gates. We will use one of them, the Toffoli gate when we build the 3-qubit Grover search algorithm circuit in Chapter 9, Grover's Search Algorithm. We are including the Fredkin gate for completeness and will not be using it in any other examples; feel free to try it out.
The multi-qubit gates in this recipe use 2, more, and 1 controlling qubit respectively:
There is (in principle) no limit to the number of controlling qubits that you can use with your gates. In the 4- and more qubit Grover search algorithm circuit in Chapter 9, Grover's Search Algorithm, we build a 4-qubit CCCX controlled...