Quantum Circuit - 4 bit adder

Qubit_Adder

# %%
from qiskit import QuantumRegister, ClassicalRegister, QuantumCircuit, Aer, execute


# %%
simulator = Aer.backends('statevector_simulator')[0]


# %%
def Full_Adder(circuit, a, b, c, d):
    circuit.ccx(a, b, d)
    circuit.cx(a, b)
    circuit.ccx(b, c, d)
    circuit.cx(b, c)
    circuit.cx(a, b)
    circuit.barrier()


# %%
A = QuantumRegister(4, name='a')
B = QuantumRegister(4, name='b')
S = QuantumRegister(4, name='s')
FC = QuantumRegister(1, name='fc')
C = ClassicalRegister(5, name='c')
FB_Adder = QuantumCircuit(A, B, S, FC, C)

# FB_Adder.x(0)
# FB_Ad0der.x(1)
# FB_Adder.x(2)
# FB_Adder.x(3)
# FB_Adder.x(4)
# FB_Adder.x(5)
# FB_Adder.x(6)
FB_Adder.x(7)
FB_Adder.barrier()

#                          C
#                    A  B  S  C
Full_Adder(FB_Adder, 3, 7, 8, 9)
Full_Adder(FB_Adder, 2, 6, 9, 10)
Full_Adder(FB_Adder, 1, 5, 10, 11)
Full_Adder(FB_Adder, 0, 4, 11, 12)

FB_Adder.measure([8, 9, 10, 11, 12], [0, 1, 2, 3, 4])
# FB_Adder.to_gate()
FB_Adder.draw(output='mpl')


# %%
job = execute(FB_Adder, simulator)
result = job.result()
result.get_counts(FB_Adder)