qiskit.circuit.QuantumCircuit.ucry¶

QuantumCircuit.
ucry
(angle_list, q_controls, q_target)¶ Attach a uniformly controlled (also called multiplexed) Ry rotation gate to a circuit.
The decomposition is base on https://arxiv.org/pdf/quantph/0406176.pdf by Shende et al.
 Parameters
angle_list (list[numbers) – list of (real) rotation angles \([a_0,...,a_{2^k1}]\)
q_controls (QuantumRegisterlist[Qubit]) – list of k control qubits (or empty list if no controls). The control qubits are ordered according to their significance in increasing order: For example if
q_controls=[q[0],q[1]]
(withq = QuantumRegister(2)
), the rotationRy(a_0)
is performed ifq[0]
andq[1]
are in the state zero, the rotationRy(a_1)
is performed ifq[0]
is in the state one andq[1]
is in the state zero, and so onq_target (QuantumRegisterQubit) – target qubit, where we act on with the singlequbit rotation gates
 Returns
the uniformly controlled rotation gate is attached to the circuit.
 Return type
 Raises
QiskitError – if the list number of control qubits does not correspond to the provided number of singlequbit unitaries; if an input is of the wrong type