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#!/usr/bin/env python3

"""

Build a simple bare-minimum quantum circuit that starts with a single

qubit (by default, in state 0) and inverts it. Run the experiment 1000

times and print the total count of the states finally observed.

Qiskit Docs: https://qiskit.org/documentation/getting_started.html

"""

import qiskit as q

def single_qubit_measure(qubits: int, classical_bits: int) -> q.result.counts.Counts:

"""

>>> single_qubit_measure(2, 2)

{'11': 1000}

>>> single_qubit_measure(4, 4)

{'0011': 1000}

"""

# Use Aer's qasm_simulator

simulator = q.Aer.get_backend("qasm_simulator")

# Create a Quantum Circuit acting on the q register

circuit = q.QuantumCircuit(qubits, classical_bits)

# Apply X (NOT) Gate to Qubits 0 & 1

circuit.x(0)

circuit.x(1)

# Map the quantum measurement to the classical bits

circuit.measure([0, 1], [0, 1])

# Execute the circuit on the qasm simulator

job = q.execute(circuit, simulator, shots=1000)

# Return the histogram data of the results of the experiment.

return job.result().get_counts(circuit)

if __name__ == "__main__":

counts = single_qubit_measure(2, 2)

print(f"Total count for various states are: {counts}")

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