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**Scientists Aim to Bridge Quantum Physics and Gravity with Entangled Atomic Clocks**
CHENNAI, August 20, 2025 – In a groundbreaking experiment, scientists are proposing to entangle three atomic clocks at varying distances from the Earth’s surface to explore the intersection of quantum mechanics and general relativity. This experiment, outlined in a recent study published in *PRX Quantum*, aims to reveal how spacetime curvature impacts quantum systems.
The two foundational pillars of 20th-century physics – quantum mechanics, governing the microscopic world, and general relativity, describing gravity and spacetime – have remained stubbornly separate. A team led by Jacob Covey, Igor Pikovski, and Johannes Borregaard from universities in the US, is taking a novel approach.
Their experiment involves creating a network of three entangled atomic clocks. The atomic clocks leverage a unique entanglement called the “W state”, known for its resilience even if one clock malfunctions. By carefully measuring shifts in the clocks’ properties due to time dilation caused by the earth’s curvature, researchers believe they can detect the influence of curved spacetime on the quantum system.
“The interplay between quantum theory and gravity is one of the most challenging problems in physics today, but also fascinating,” explained Igor Pikovski.
If successful, this would represent a major leap in probing the connection between quantum theory and general relativity in a laboratory setting. It could also open the door to testing fundamental quantum principles like unitarity, linearity, and the Born rule under the influence of gravity. Deviations from expected behavior could indicate new physics beyond the standard quantum model.
Djordje Minic, a physics professor at Virginia Tech, noted the experiment’s ambition, stating it is “at the limit of what is experimentally possible” due to the fragility of entangled states. However, the potential rewards are significant, paving the way for future experiments in more extreme gravitational environments and potentially aiding in the detection of dark matter and gravitational waves.
This experiment illustrates that solving some of the universe’s biggest mysteries doesn’t always require massive machines, but can be achieved by cleverly combining existing precision technologies.
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