Modeling dynamics of entangled physical systems with superconducting quantum computer

TL;DR

This paper demonstrates the simulation of entangled quantum system dynamics using a five-qubit superconducting quantum computer, highlighting quantum interference effects and discussing device limitations and scalability.

Contribution

It presents the first implementation of quantum algorithms simulating spin system dynamics with entanglement on a real superconducting quantum processor.

Findings

Dynamics governed by quantum interference effects.

Results are highly sensitive to initial phase parameters.

Discusses limitations and potential for scaling to larger systems.

Abstract

We implement several quantum algorithms in real five-qubit superconducting quantum processor IBMqx4 to perform quantum computation of the dynamics of spin-1/2 particles interacting directly and indirectly through the boson field. Particularly, we focus on effects arising due to the presence of entanglement in the initial state of the system. The dynamics is implemented in a digital way using Trotter expansion of evolution operator. Our results demonstrate that dynamics in our modeling based on real device is governed by quantum interference effects being highly sensitive to phase parameters of the initial state. We also discuss limitations of our approach due to the device imperfection as well as possible scaling towards larger systems.