Quantum gravity sensor opens window into world beneath our feet(ft.com)
ft.com
Quantum gravity sensor opens window into world beneath our feet
https://www.ft.com/content/cd5db0c8-0bb2-47a0-9e40-57c3e9d95170
https://www.ft.com/content/cd5db0c8-0bb2-47a0-9e40-57c3e9d95170
> The sensor uses a quantum technique called atom interferometry. Ultra-cold rubidium atoms, falling under the influence of gravity, are illuminated with laser beams. The resulting interference patterns depend on the speed with which they are falling — and indicate with great precision the strength and gradient of the local gravitational field, which is influenced in turn by what lies beneath the ground.