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Variational Quantum Simulation of General Processes

License: GNU General Public License v3.0

Jupyter Notebook 30.12% Mathematica 69.88%
stochastic-process schrodinger-equation hhl quantum-algorithm variational-quantum-algorithm

physrevlett.125.010501's Introduction

Variational Quantum Simulation of General Processes

Original authors of the paper: Suguru Endo, Jinzhao Sun, Ying Li, Simon C. Benjamin, and Xiao Yuan

Link to paper: https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.125.010501

Author of notebook: Óscar Amaro

Abstract: Variational quantum algorithms have been proposed to solve static and dynamic problems of closed many-body quantum systems. Here we investigate variational quantum simulation of three general types of tasks—generalized time evolution with a non-Hermitian Hamiltonian, linear algebra problems, and open quantum system dynamics. The algorithm for generalized time evolution provides a unified framework for variational quantum simulation. In particular, we show its application in solving linear systems of equations and matrix-vector multiplications by converting these algebraic problems into generalized time evolution. Meanwhile, assuming a tensor product structure of the matrices, we also propose another variational approach for these two tasks by combining variational real and imaginary time evolution. Finally, we introduce variational quantum simulation for open system dynamics. We variationally implement the stochastic Schrödinger equation, which consists of dissipative evolution and stochastic jump processes. We numerically test the algorithm with a 6-qubit 2D transverse field Ising model under dissipation.

Data was retrieved from the original plots using the tool WebPlotDigitizer https://apps.automeris.io/wpd/

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