def load(self, slot):
"""Load the internal simulator representation (statevector, probability,
density matrix, clifford table)
Works on all qubits, and prevents reordering (like barrier).
Args:
slot (int): a slot to load from
Returns:
QuantumCircuit: with attached command
Raises:
ExtensionError: malformed command
"""
tuples = []
if isinstance(self, QuantumCircuit):
for register in self.regs.values():
if isinstance(register, QuantumRegister):
tuples.append(register)
if not tuples:
raise ExtensionError("no qubits for load")
if slot is None:
raise ExtensionError("no load slot passed")
qubits = []
for tuple_element in tuples:
if isinstance(tuple_element, QuantumRegister):
for j in range(tuple_element.size):
self._check_qubit((tuple_element, j))
qubits.append((tuple_element, j))
else:
self._check_qubit(tuple_element)
qubits.append(tuple_element)
self._check_dups(qubits)
return self._attach(Load(slot, qubits, self))
def noise(self, switch):
"""Turn noise on/off in simulator.
Works on all qubits, and prevents reordering (like barrier).
Args:
switch (int): turn noise on (1) or off (0)
Returns:
QuantumCircuit: with attached command
Raises:
ExtensionError: malformed command
"""
tuples = []
if isinstance(self, QuantumCircuit):
for register in self.qregs.values():
tuples.append(register)
if not tuples:
raise ExtensionError("no qubits for noise")
if switch is None:
raise ExtensionError("no noise switch passed")
qubits = []
for tuple_element in tuples:
if isinstance(tuple_element, QuantumRegister):
for j in range(tuple_element.size):
self._check_qubit((tuple_element, j))
qubits.append((tuple_element, j))
else:
self._check_qubit(tuple_element)
qubits.append(tuple_element)
self._check_dups(qubits)
return self._attach(Noise(switch, qubits, self))
def barrier(self, *tuples):
"""Apply barrier to tuples (reg, idx)."""
tuples = list(tuples)
if len(tuples) == 0: # TODO: implement this for all single qubit gates
if isinstance(self, QuantumCircuit):
for register in self.regs.values():
if isinstance(register, QuantumRegister):
tuples.append(register)
if len(tuples) == 0:
raise ExtensionError("no arguments passed")
qubits = []
for tuple_element in tuples:
if isinstance(tuple_element, QuantumRegister):
for j in range(tuple_element.size):
self._check_qubit((tuple_element, j))
qubits.append((tuple_element, j))
else:
self._check_qubit(tuple_element)
qubits.append(tuple_element)
self._check_dups(qubits)
return self._attach(Barrier(qubits, self))
def __init__(self, param, qubit, circ=None):
"""Create new reset instruction."""
if len(param) != 3:
raise ExtensionError("expected 3 parameters")
super(UBase, self).__init__("U", param, [qubit], circ)
