def circuit_to_instruction(circuit):
"""Build an ``Instruction`` object from a ``QuantumCircuit``.
The instruction is anonymous (not tied to a named quantum register),
and so can be inserted into another circuit. The instruction will
have the same string name as the circuit.
Args:
circuit (QuantumCircuit): the input circuit.
Return:
Instruction: an instruction equivalent to the action of the
input circuit. Upon decomposition, this instruction will
yield the components comprising the original circuit.
"""
instruction = Instruction(
name=circuit.name,
num_qubits=sum([qreg.size for qreg in circuit.qregs]),
num_clbits=sum([creg.size for creg in circuit.cregs]),
params=[])
instruction.control = None
def find_bit_position(bit):
"""find the index of a given bit (Register, int) within
a flat ordered list of bits of the circuit
"""
if isinstance(bit[0], QuantumRegister):
ordered_regs = circuit.qregs
else:
ordered_regs = circuit.cregs
reg_index = ordered_regs.index(bit[0])
return sum([reg.size for reg in ordered_regs[:reg_index]]) + bit[1]
definition = circuit.data.copy()
if instruction.num_qubits > 0:
q = QuantumRegister(instruction.num_qubits, 'q')
if instruction.num_clbits > 0:
c = ClassicalRegister(instruction.num_clbits, 'c')
definition = list(
map(
lambda x:
(x[0], list(map(lambda y: (q, find_bit_position(y)), x[1])),
list(map(lambda y:
(c, find_bit_position(y)), x[2]))), definition))
instruction.definition = definition
return instruction
def circuit_to_instruction(circuit, parameter_map=None):
"""Build an ``Instruction`` object from a ``QuantumCircuit``.
The instruction is anonymous (not tied to a named quantum register),
and so can be inserted into another circuit. The instruction will
have the same string name as the circuit.
Args:
circuit (QuantumCircuit): the input circuit.
parameter_map (dict): For parameterized circuits, a mapping from
parameters in the circuit to parameters to be used in the instruction.
If None, existing circuit parameters will also parameterize the
instruction.
Raises:
QiskitError: if parameter_map is not compatible with circuit
Return:
Instruction: an instruction equivalent to the action of the
input circuit. Upon decomposition, this instruction will
yield the components comprising the original circuit.
"""
if parameter_map is None:
parameter_map = {p: p for p in circuit.parameters}
if parameter_map.keys() != circuit.parameters:
raise QiskitError(('parameter_map should map all circuit parameters. '
'Circuit parameters: {}, parameter_map: {}').format(
circuit.parameters, parameter_map))
instruction = Instruction(name=circuit.name,
num_qubits=sum([qreg.size for qreg in circuit.qregs]),
num_clbits=sum([creg.size for creg in circuit.cregs]),
params=sorted(parameter_map.values(), key=lambda p: p.name))
instruction.control = None
def find_bit_position(bit):
"""find the index of a given bit (Register, int) within
a flat ordered list of bits of the circuit
"""
if isinstance(bit[0], QuantumRegister):
ordered_regs = circuit.qregs
else:
ordered_regs = circuit.cregs
reg_index = ordered_regs.index(bit[0])
return sum([reg.size for reg in ordered_regs[:reg_index]]) + bit[1]
target = circuit.copy()
target._substitute_parameters(parameter_map)
definition = target.data
if instruction.num_qubits > 0:
q = QuantumRegister(instruction.num_qubits, 'q')
if instruction.num_clbits > 0:
c = ClassicalRegister(instruction.num_clbits, 'c')
definition = list(map(lambda x:
(x[0],
list(map(lambda y: (q, find_bit_position(y)), x[1])),
list(map(lambda y: (c, find_bit_position(y)), x[2]))), definition))
instruction.definition = definition
return instruction
