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I would like to make a code that is executed iteratively.

For example: in a one-qubit system, I would like to make a measurement 100 times in each angle theta = [ 0, ..., 2π] with the circuit as follows.

circuit

Can we make an iterative code as follows? (This is completely wrong !)

theta = 0
for theta in np.arange(0, np.pi, np.pi/100):
    qreg q[1]
    creg c[1]
    ry(theta) q[0]
    measure q[0] -> c[0]

In addition, can we make a function whose argument is theta as follows? (This is completely wrong !)

function q_citcuit(theta)
    qreg q[1]
    creg c[1]
    ry(theta) q[0]
    measure q[0] -> c[0]
    return result
id_zo
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2 Answers2

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In addition to specifying the gates for each iteration, you'd need to define a circuit and registers, running and measuring each time. Here's a Jupyter notebook that demonstrates these concepts: https://nbviewer.jupyter.org/github/Qiskit/qiskit-tutorials/blob/master/qiskit/basics/1_getting_started_with_qiskit.ipynb

James Weaver
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Once you go through the tutorial James sent you and get the basics down, I think the following information will be helpful for your specific experiment you want to run. You can execute a list of circuits in one execution call, and you can create these circuits iteratively. 

theta_list = [...]  # Whatever angles you want to put in here
circuit_list = []  # This will be what is executed

# After instantiating the QuantumRegisters and ClassicalRegisters as qreg and creg
for index in range(len(theta_list)):
   qc = QuantumCircuit(qreg, creg)
   qc.ry(theta_list[index], qreg[0])
   qc.measure(qreg[0], creg[0])
   circuit_list.append(qc)

# After choosing a backend
job = execute(circuit_list, backend, shots=100)

This should work for you, but, again, I would first look over the tutorial in James' answer to make sure you have the core concepts down and can fully understand what is going on in this code.

Matthew Stypulkoski
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