An improved lower bound for superluminal quantum communications

TL;DR

This paper reports an improved experiment that significantly raises the lower bound on the possible velocities of superluminal quantum communications, but finds no evidence supporting their existence.

Contribution

The study presents a more sensitive experimental setup that increases the lower bound on superluminal communication velocities by two orders of magnitude.

Findings

No evidence for superluminal communications was observed.

Established a higher lower bound for superluminal velocities.

Experiment improves detection sensitivity by approximately 100 times.

Abstract

Superluminal communications have been proposed to solve the Einstein, Podolsky and Rosen (EPR) paradox. So far, no evidence for these superluminal communications has been obtained and only lower bounds for the superluminal velocities have been established. In this paper we describe an improved experiment that increases by about two orders of magnitude the maximum detectable superluminal velocities. The locality, the freedom-of-choice and the detection loopholes are not addressed here. No evidence for superluminal communications has been found and a new higher lower bound for their velocities has been established.