qiskit.aqua.circuits.WeightedSumOperator

__init__(num_state_qubits, weights, i_state=None, i_sum=None)

Computes the weighted sum controlled by state qubits

Parameters

• num_state_qubits (int) – number of state qubits
• weights (Union(list, numpy.ndarray)) – weights per state qubits
• i_state (Optional(Union(list, numpy.ndarray))) – indices of state qubits, set to range(num_state_qubits) if None
• i_sum (Optional(int)) – indices of target qubits (that represent the resulting sum), set to range(num_state_qubits, num_state_qubits + req_num_sum_qubits) if None

Raises

AquaError – invalid input

build(qc, q, q_ancillas=None, params=None)

Adds corresponding sub-circuit to given circuit

Parameters

• qc (QuantumCircuit) – quantum circuit
• q (list) – list of qubits (has to be same length as self._num_qubits)
• q_ancillas (list) – list of ancilla qubits (or None if none needed)
• params (list) – parameters for circuit

build_controlled(qc, q, q_control, q_ancillas=None, use_basis_gates=True)

Adds corresponding controlled sub-circuit to given circuit

Parameters

• qc (QuantumCircuit) – quantum circuit
• q (list) – list of qubits (has to be same length as self._num_qubits)
• q_control (Qubit) – control qubit
• q_ancillas (list) – list of ancilla qubits (or None if none needed)
• use_basis_gates (bool) – use basis gates for expansion of controlled circuit

build_controlled_inverse(qc, q, q_control, q_ancillas=None, use_basis_gates=True)

Adds controlled inverse of corresponding sub-circuit to given circuit

Parameters

• qc (QuantumCircuit) – quantum circuit
• q (list) – list of qubits (has to be same length as self._num_qubits)
• q_control (Qubit) – control qubit
• q_ancillas (list) – list of ancilla qubits (or None if none needed)
• use_basis_gates (bool) – use basis gates for expansion of controlled circuit

build_controlled_inverse_power(qc, q, q_control, power, q_ancillas=None, use_basis_gates=True)

Adds controlled, inverse, power of corresponding circuit. May be overridden if a more efficient implementation is possible

build_controlled_power(qc, q, q_control, power, q_ancillas=None, use_basis_gates=True)

Adds controlled power of corresponding circuit. May be overridden if a more efficient implementation is possible

build_inverse(qc, q, q_ancillas=None)

Adds inverse of corresponding sub-circuit to given circuit

Parameters

• qc (QuantumCircuit) – quantum circuit
• q (list) – list of qubits (has to be same length as self._num_qubits)
• q_ancillas (list) – list of ancilla qubits (or None if none needed)

build_inverse_power(qc, q, power, q_ancillas=None)

Adds inverse power of corresponding circuit. May be overridden if a more efficient implementation is possible

build_power(qc, q, power, q_ancillas=None)

Adds power of corresponding circuit. May be overridden if a more efficient implementation is possible

get_num_qubits()

returns number of qubits

get_num_qubits_controlled()

returns number of qubits controlled

static get_required_sum_qubits(weights)

get required sum qubits

returns num carry qubits

returns num state qubits

returns num sum qubits

Returns the number of target qubits

required_ancillas()

required ancillas

required_ancillas_controlled()

returns required ancillas controlled

returns weights