Device independent witness of arbitrary dimensional quantum systems employing binary outcome measurements

TL;DR

This paper introduces a new device-independent dimension witness for quantum systems that works with only binary outcome measurements, enabling testing of high-dimensional quantum systems with minimal assumptions.

Contribution

It proposes a novel variant of the random access code as a dimension witness applicable to arbitrarily large quantum systems using only binary measurements.

Findings

Effective for high-dimensional systems

Requires only binary outcome measurements

Simplifies implementation of dimension testing

Abstract

Device independent dimension witnesses (DW) are a remarkable way to test the dimension of a quantum system in a prepare-and-measure scenario imposing minimal assumptions on the internal features of the devices. However, as the dimension increases, the major obstacle in the realization of DW arises due to the requirement of many outcome quantum measurements. In this article, we propose a new variant of a widely studied communication task (random access code) and take its average payoff as the DW. The presented DW applies to arbitrarily large quantum systems employing only binary outcome measurements.