Calculation of $π$ on the IBM quantum computer and the accuracy of
  one-qubit operations
A quantum algorithm for the calculation of $\pi$ is proposed and implemented
on the five-qubit IBM quantum computer with superconducting qubits. We find
$\pi=3.157\pm0.017$. The error is due to the noise of quantum one-qubit
operations and measurements. The results can be used for estimating the errors
of the quantum computer and suggest that the errors are purely random.
G. A. Bochkin S. I. Doronin E. B. Fel'dman A. I. Zenchuk