Quantum World

The latest version of this notebook is available on https://github.com/QISKit/qiskit-tutorial.

Contributors

Jay Gambetta and Ismael Faro



In [1]:

    
from qiskit import ClassicalRegister, QuantumRegister, QuantumCircuit
from qiskit import execute
from qiskit import IBMQ
from qiskit.backends.ibmq import least_busy
from qiskit.wrapper.jupyter import *
# import basic plot tools
from qiskit.tools.visualization import plot_histogram, circuit_drawer



In [2]:

    
IBMQ.load_accounts()



In [3]:

    
IBMQ.backends()









    Out[3]:





[<IBMQBackend('ibmqx4') from IBMQ()>,
 <IBMQBackend('ibmqx5') from IBMQ()>,
 <IBMQBackend('ibmqx2') from IBMQ()>,
 <IBMQBackend('ibmq_16_melbourne') from IBMQ()>,
 <IBMQBackend('ibmq_qasm_simulator') from IBMQ()>]



In [4]:

    
backend = least_busy(IBMQ.backends(simulator=False))
print("The least busy backend is " + backend.name())









    



The least busy backend is ibmq_16_melbourne



In [5]:

    
%%qiskit_job_status
q = QuantumRegister(2)
c = ClassicalRegister(2)
qc = QuantumCircuit(q, c)
qc.h(q[0])
qc.cx(q[0], q[1])
qc.measure(q, c)
job_exp = execute(qc, backend=backend, shots=1024, max_credits=3)



In [6]:

    
plot_histogram(job_exp.result().get_counts(qc))
print('You have made entanglement!')









    












    



You have made entanglement!

The circuit that was run on the machine is



In [7]:

    
circuit_drawer(qc)









    Out[7]: