A cold-atom gravity sensor could detect buried pipes, sinkholes, and oil reserves without digging a single hole. For decades, finding what lies underground has meant drilling, digging, or relying on limited tools. Ground-penetrating radar cannot see deep enough. Classical microgravity sensors lack sensitivity. Seismic surveys are prohibitively expensive. This project aims to build a practical quantum gravity sensor using cold-atom interferometry—a technique that measures tiny changes in how rubidium atoms fall in a vacuum, revealing the density of material below ground. If successful, the sensor could locate forgotten pipes before road crews dig up streets, assess sinkhole risk without exploratory drilling, and identify dry oil wells before expensive drilling begins. It could also open brownfield land for development by mapping buried hazards cheaply. The UK consortium of companies and universities is tackling the engineering challenges needed to turn a laboratory technique into a field-deployable instrument. This is applied engineering with a clear near-term target: making invisible underground structures visible at a fraction of current cost.
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"Despite our increasing ability to detect and monitor objects that exist on land, sea, around buildings or in space, our ability to detect objects beneath the ground has not improved significantly. When it comes to attempting to locate a buried and forgotten pipe, telling the extent of a sink hole or assessing the quality of infrastructure we still often resort to digging or drilling holes. This presents a huge economic and societal cost as road networks are dug up, oil wells are dry or brown-field land is left undeveloped. Existing techniques are all fundamentally limited in either their sensitivity (classical microgravity), their penetration (Ground Penetrating Radar) or their cost (seismic). For over 30 years, universities and academics have been exploiting the strange effects of quantum superposition to measure gravity with astonishing sensitivity. Using a process called cold-atom interferometry, the wave-partial duality of a rubidium atom is compared to the phase of a laser beam in a way which can detect very small changes in the way atoms fall freely in a vacuum. Changes in this free-fall can be used to determine the local strength of gravity and if this measurement is sensitive enough, the measurement can be used to tell whether there are voids, pipes, tunnels, oil and gas reserves in the ground beneath your feet. Although the potential is there, there are huge scientific and engineering challenges to delivering this performance. This project is proposed by the UK consortium of the best scientific and engineering companies the UK has to offer. Working with leading UK universities, these companies are looking to overcome these challenges, and develop a new industry of 'quantum' cold-atom sensors in the UK. If these advanced performances can be demonstrated, the economic and societal benefit of this new 'quantum' industry in the UK is expected to be significant and long-lasting."
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