from qiskit import *
from qiskit.visualization import *
from qiskit.circuit.library import QFT
from numpy import *
backend = BasicAer.get_backend('qasm_simulator')
peT = QuantumCircuit(3)
peT.add_register(QuantumRegister(1,'qr'))
peT.x(3)
<qiskit.circuit.instructionset.InstructionSet at 0x7f424103fe80>
for qubit in range(3):
peT.h(qubit)
peT.draw()
┌───┐ q_0: ┤ H ├ ├───┤ q_1: ┤ H ├ ├───┤ q_2: ┤ H ├ ├───┤ qr_0: ┤ X ├ └───┘
repetitions = 1
for counting_qubit in range(3):
for i in range(repetitions):
peT.cp(pi/4, counting_qubit, 3)
repetitions *= 2
peT.draw()
┌───┐ q_0: ┤ H ├─■───────────────────────────────────────────────────────────── ├───┤ │ q_1: ┤ H ├─┼────────■────────■─────────────────────────────────────────── ├───┤ │ │ │ q_2: ┤ H ├─┼────────┼────────┼────────■────────■────────■────────■─────── ├───┤ │P(π/4) │P(π/4) │P(π/4) │P(π/4) │P(π/4) │P(π/4) │P(π/4) qr_0: ┤ X ├─■────────■────────■────────■────────■────────■────────■─────── └───┘
qftinv = QFT(3, inverse=True)
qftinv.draw()
┌───┐ q_0: ─X─┤ H ├─■──────────────■─────────────────────── │ └───┘ │P(-π/2) ┌───┐ │ q_1: ─┼───────■────────┤ H ├─┼─────────■───────────── │ └───┘ │P(-π/4) │P(-π/2) ┌───┐ q_2: ─X──────────────────────■─────────■────────┤ H ├ └───┘
qftinv.add_register(QuantumRegister(1,'qr'))
qftinv.add_register(ClassicalRegister(3))
qftinv.draw()
┌───┐ q_0: ─X─┤ H ├─■──────────────■─────────────────────── │ └───┘ │P(-π/2) ┌───┐ │ q_1: ─┼───────■────────┤ H ├─┼─────────■───────────── │ └───┘ │P(-π/4) │P(-π/2) ┌───┐ q_2: ─X──────────────────────■─────────■────────┤ H ├ └───┘ qr_0: ──────────────────────────────────────────────── c0: 3/════════════════════════════════════════════════
peT = peT + qftinv
/tmp/ipykernel_9164/1987650100.py:1: DeprecationWarning: The QuantumCircuit.__add__() method is being deprecated.Use the compose() method which is more flexible w.r.t circuit register compatibility. peT = peT + qftinv /home/al/.local/lib/python3.9/site-packages/qiskit/circuit/quantumcircuit.py:869: DeprecationWarning: The QuantumCircuit.combine() method is being deprecated. Use the compose() method which is more flexible w.r.t circuit register compatibility. return self.combine(rhs)
peT.draw()
┌───┐ » q_0: ┤ H ├─■──────────────────────────────────────────────────────────────X─» ├───┤ │ │ » q_1: ┤ H ├─┼────────■────────■────────────────────────────────────────────┼─» ├───┤ │ │ │ │ » q_2: ┤ H ├─┼────────┼────────┼────────■────────■────────■────────■────────X─» ├───┤ │P(π/4) │P(π/4) │P(π/4) │P(π/4) │P(π/4) │P(π/4) │P(π/4) » qr_0: ┤ X ├─■────────■────────■────────■────────■────────■────────■──────────» └───┘ » c0: 3/═══════════════════════════════════════════════════════════════════════» » « ┌───┐ « q_0: ┤ H ├─■──────────────■─────────────────────── « └───┘ │P(-π/2) ┌───┐ │ « q_1: ──────■────────┤ H ├─┼─────────■───────────── « └───┘ │P(-π/4) │P(-π/2) ┌───┐ « q_2: ─────────────────────■─────────■────────┤ H ├ « └───┘ «qr_0: ───────────────────────────────────────────── « «c0: 3/═════════════════════════════════════════════ «
for i in range(3):
peT.measure(i,i)
peT.draw(output='mpl')
t_peT = transpile(peT, backend)
peTobj = assemble(t_peT, shots = 2048)
results = backend.run(peTobj).result()
plot_histogram(results.get_counts())