#have to install the qiskit library first before we do anything !pip install qiskit #do our usual installation of some standard libraries %matplotlib inline import numpy as np #you need to get your personal IBM Token from IBM Quantum Experience #put your token inside '*****' token='******' from qiskit import QuantumCircuit, execute, Aer, IBMQ IBMQ.save_account(token) from qiskit.compiler import transpile, assemble from qiskit.tools.jupyter import * from qiskit.visualization import * from qiskit import QuantumCircuit, QuantumRegister, ClassicalRegister provider = IBMQ.load_account()

#execute this cell to start the initialization process n = 3 #number of qubits grover_circuit = QuantumCircuit(n)

# complete this code block to initialize all the qubits with Hadamards, and then draw the circuit # initialize circuit here between lines #__________________________________________ #________________________________________ grover_circuit.draw()

# Copy and past your code for the Oracle from the IBM Composer here # Execute this cell to have the full circuit drawn for you so you can # double check everything looks right. #copy/paste code here between the lines #_____________________________ #_____________________________ #draw the circut to show the gates you have added grover_circuit.draw()

# This cell adds a general diffuser to the grover circuit. #add Hadamards to all qubits grover_circuit.h(0) grover_circuit.h(1) grover_circuit.h(2) #add X to all qubits grover_circuit.x(0) grover_circuit.x(1) grover_circuit.x(2) #perform a multi-controled z gate using primitive gates grover_circuit.barrier(0,1,2) grover_circuit.h(2) #this always goes on last qubit grover_circuit.ccx(0,1,2) #the target is always the last quibt, with controls from all others grover_circuit.h(2) #this always goes on last qubit grover_circuit.barrier(0,1,2) #add more X gates to all qubits grover_circuit.x(0) grover_circuit.x(1) grover_circuit.x(2) #add more Hadamards to all qubits grover_circuit.h(0) grover_circuit.h(1) grover_circuit.h(2)

grover_circuit.draw()

sv_sim = Aer.get_backend('statevector_simulator') job_sim = execute(grover_circuit, sv_sim) statevec = job_sim.result().get_statevector() grover_circuit.measure_all() qasm_simulator = Aer.get_backend('qasm_simulator') shots = 1024 results = execute(grover_circuit, backend=qasm_simulator, shots=shots).result() answer = results.get_counts() plot_histogram(answer)

backend = provider.backend.****** # replace the **** with the name of the computer you want to use EXAMPLE: ibmq_quito shots = 1024 results = execute(grover_circuit, backend=backend, shots=shots).result() answer = results.get_counts() plot_histogram(answer)