Like a classical computer, a quantum computer operates on bits. However, while classical bits can only be found in the states 0 and 1, a quantum bit, or qubit, can represent the values 0 and 1, or linear combinations of both. These linear combinations are known as superpositions (or superposition states).
"A general computation on a quantum computer proceeds in very much the same way as noise cancellation. To begin, one prepares a superposition of all possible computation states. This is then used as an input to a quantum circuit that selectively interferes the components of the superposition according to a prescribed algorithm. What remains after cancelling the relative amplitudes and phases of the input state is the solution to the computation performed by the quantum circuit."
from qiskit import QuantumRegister, ClassicalRegister, QuantumCircuit
from numpy import pi
qreg_q = QuantumRegister(1, 'q')
creg_c = ClassicalRegister(1, 'c')
circuit = QuantumCircuit(qreg_q, creg_c)
circuit.reset(qreg_q[0])
circuit.h(qreg_q[0])
circuit.measure(qreg_q[0], creg_c[0])