def _generate_circuit(self, elements: Iterable[Clifford],
lengths: Iterable[int]) -> List[QuantumCircuit]:
"""Return the RB circuits constructed from the given element list.
Args:
elements: A list of Clifford elements
lengths: A list of RB sequences lengths.
Returns:
A list of :class:`QuantumCircuit`s.
Additional information:
The circuits are constructed iteratively; each circuit is obtained
by extending the previous circuit (without the inversion and measurement gates)
"""
qubits = list(range(self.num_qubits))
circuits = []
circs = [QuantumCircuit(self.num_qubits) for _ in range(len(lengths))]
for circ in circs:
circ.barrier(qubits)
circ_op = Clifford(np.eye(2 * self.num_qubits))
for current_length, group_elt_circ in enumerate(elements):
if isinstance(group_elt_circ, tuple):
group_elt_gate = group_elt_circ[0]
group_elt_op = group_elt_circ[1]
else:
group_elt_gate = group_elt_circ
group_elt_op = Clifford(group_elt_circ)
if not isinstance(group_elt_gate, Gate):
group_elt_gate = group_elt_gate.to_gate()
circ_op = circ_op.compose(group_elt_op)
for circ in circs:
circ.append(group_elt_gate, qubits)
circ.barrier(qubits)
if current_length + 1 in lengths:
# copy circuit and add inverse
inv = circ_op.adjoint()
rb_circ = circs.pop()
rb_circ.append(inv, qubits)
rb_circ.barrier(qubits)
rb_circ.metadata = {
"experiment_type": self._type,
"xval": current_length + 1,
"group": "Clifford",
"physical_qubits": self.physical_qubits,
}
rb_circ.measure_all()
circuits.append(rb_circ)
return circuits
def _generate_circuit(self, elements: Iterable[Clifford],
lengths: Iterable[int]):
"""Return the RB circuits constructed from the given element list.
Args:
elements: A list of Clifford elements
lengths: A list of RB sequences lengths.
Returns:
List[QuantumCircuit]: A list of :class:`QuantumCircuit`s.
Additional information:
The circuits are constructed iteratively; each circuit is obtained
by extending the previous circuit (without the inversion and measurement gates)
"""
qubits = list(range(self.num_qubits))
circuits = []
circ = QuantumCircuit(self.num_qubits)
circ.barrier(qubits)
circ_op = Clifford(np.eye(2 * self.num_qubits))
for current_length, group_elt in enumerate(elements):
circ_op = circ_op.compose(group_elt)
circ.append(group_elt, qubits)
circ.barrier(qubits)
if current_length + 1 in lengths:
# copy circuit and add inverse
inv = circ_op.adjoint()
rb_circ = circ.copy()
rb_circ.append(inv, qubits)
rb_circ.barrier(qubits)
rb_circ.metadata = {
"experiment_type": self._type,
"xdata": current_length + 1,
"ylabel": self.num_qubits * "0",
"group": "Clifford",
"qubits": self.physical_qubits,
}
rb_circ.measure_all()
circuits.append(rb_circ)
return circuits