classical_qpe

This module contains the necessary functions and classes to implement the classical Quantum Phase Estimation with the inverse of the Quantum Fourier Transform. The following references were used:

Brassard, G., Hoyer, P., Mosca, M., & Tapp, A. (2000). Quantum amplitude amplification and estimation. AMS Contemporary Mathematics Series, 305. https://arxiv.org/abs/quant-ph/0005055v1

NEASQC deliverable: D5.1: Review of state-of-the-art for Pricing and Computation of VaR

Author: Gonzalo Ferro Costas & Alberto Manzano Herrero

class QQuantLib.PE.classical_qpe.CQPE(**kwargs)

Class for using classical Quantum Phase Estimation, with inverse of Quantum Fourier Transformation.

Parameters:

  • kwars (dictionary) – dictionary that allows the configuration of the CQPE algorithm: Implemented keys:

  • initial_state (kwargs, QLM Program) – QLM Program with the initial Psi state over the Grover-like operator will be applied Only used if oracle is None

  • unitary_operator (kwargs, QLM gate or routine) – Grover-like operator which autovalues want to be calculated Only used if oracle is None

  • cbits_number (kwargs, int) – number of classical bits for phase estimation

  • qpu (kwargs, QLM solver) – solver for simulating the resulting circuits

  • shots (kwargs, int) – number of shots for quantum job. If 0 exact probabilities will be computed.

run()

Creates the quantum phase estimation routine