An unconditional experimental test of Nonclassicality

TL;DR

This paper presents a new nonclassicality test that works with very low detection efficiency without extra assumptions, using a prepare-and-measure setup with random device pairing, enabling practical device-independent quantum protocols.

Contribution

The authors introduce a novel nonclassicality test that is robust to low detection efficiencies and does not rely on device independence assumptions, demonstrated experimentally.

Findings

Successful experimental implementation of the nonclassicality test.

The test operates effectively with arbitrarily low detection efficiency.

Potential for practical device-independent quantum applications.

Abstract

We theoretically introduce and experimentally demonstrate the realization of a nonclassicality test that allows for arbitrarily low detection efficiency without invoking any extra assumptions as independence of the devices. Our test and its implementation is set in a prepare-and-measure scenario with an upper limit on the communication capacity of the channel through which the systems are communicated. The essence for our novel test is the use of two preparation and two measurement devices, which are randomly paired in each round. Our work opens up the possibility of experimental realizations of device independent protocols with current off-the-shelf technology.