Quantum Steering on IBMQ

TL;DR

This paper experimentally investigates quantum steering using IBMQ quantum computers by performing collision model simulations, reconstructing state ensembles, and quantifying steering with semidefinite programming, revealing device noise effects.

Contribution

First experimental demonstration of quantum steering on IBMQ devices using collision models and state tomography to quantify steering.

Findings

Quantum steering observed in IBMQ simulations.

Device noise affects steering performance.

Different measurement strategies produce varying state ensembles.

Abstract

We use contemporary quantum computers to experimentally investigate quantum steering ofan open quantum system by measurements on its environment. On three IBMQ processors wedistinguish a qubit as the open system and perform pairwise interactions with multiple environmentancillas, following a collision model approach. Different measurement strategies on the ancillaslead to different state ensembles of the open system, which are reconstructed by employing statetomography. The amount of steering within the resulting assemblages is quantified with the help of asemidefinite program. We successfully observe the presence of quantum steering in our experimentalsimulations, and can discriminate the different performance qualities and noise levels of the selectedquantum devices.