PQC

from functools import reduce
from qiskit import QuantumCircuit, Aer, execute, ClassicalRegister, QuantumRegister
from math import asin, sqrt, ceil
from qiskit.visualization import plot_histogram
import matplotlib.pyplot as plt
def prob_to_angle(prob):
    """
    Converts a given P(psi) value into an equivalent theta value.
    """
    return 2*asin(sqrt(prob))
def pqc(backend, prior, modifiers, shots=1, hist=False, measure=False):
    # Prepare the circuit with qubits and a classical bit to hold the measurement
    qr = QuantumRegister(7)
    cr = ClassicalRegister(1)
    qc = QuantumCircuit(qr, cr) if measure else QuantumCircuit(qr)
    # INSERT QUANTUM CIRCUIT HERE
    qc = QuantumCircuit(4)
    
    # measure the qubit only if we want the measurement to be included
    if measure:
        qc.measure(qr[0], cr[0])
    results = execute(qc,backend, shots=shots).result().get_counts()
    return plot_histogram(results, figsize=(12,4)) if hist else results
#CAPTION The basic pqc-function
qc=QuantumCircuit(7)