26th Australian Institute of Physics Congress and the Australian and New Zealand Conference on Optics and Photonics

Unblockable Communication With Gravity

Not scheduled

20m

Belinda Hutchinson Building (The University of Sydney )

Contributed Oral AIP | Quantum Science and Technology (QST)

Speaker

Andrew Groszek (The University of Queensland)

Description

All modern wireless communication technologies are based on electromagnetism. However, electromagnetic signals are readily susceptible to screening and blocking, so their availability cannot be guaranteed in adverse environments.

This raises a fundamental question: Can information be transmitted through an unblockable channel? Here we show that gravity, under physically realistic conditions, offers a suitable path. We propose, analyse, and implement a wireless communication protocol in which a broadcaster encodes a binary message by moving a mass, while a receiver detects the resulting gravitational signal with a gravimeter. We validate this scheme experimentally, successfully transmitting a gravitational message a distance of ~0.7 m through a brick wall at a rate of 1 bit/minute.

We believe that this is the first use of gravitational forces to transmit and receive a message. These results establish gravity as a viable platform for practically unblockable communication.

Reference: A. J. Groszek et al., arXiv:2511.16710 (2025), under review at Science Advances.