A long-awaited experiment designed to determine whether gravity behaves according to quantum mechanics may do more than resolve one of physics’ deepest mysteries. Researchers argue that confirming gravity’s quantum nature could eventually open the door to technologies once considered impossible—including a form of antigravity.

Gravity is the weakest of nature’s four fundamental forces, yet it remains one of its greatest mysteries. Despite decades of work, physicists still lack a theory that successfully unites Einstein’s description of gravity with the strange rules of quantum mechanics. That puzzle may soon face an important experimental test.

Physicist Vlatko Vedral of the University of Oxford argues that the proposed BMV experiment—named for researchers Sougato Bose, Chiara Marletto and Vedral—could determine whether gravity itself behaves as a quantum phenomenon. The experiment would place tiny masses into quantum superposition to see whether gravity can produce quantum entanglement, a result that classical gravity cannot explain.

If successful, the implications would extend well beyond confirming a long-sought theory of quantum gravity.

Vedral suggests that understanding gravity at the quantum level could someday enable entirely new technologies, including gravity-based quantum computing. Even more provocatively, he and colleagues have proposed a theoretical mechanism that could produce a limited form of gravitational repulsion—what many would recognize as “antigravity.”

The proposal, however, comes with significant caveats. The predicted repulsive effect would emerge only under carefully controlled quantum measurement conditions rather than producing a device capable of overcoming Earth’s gravity. On average, gravity would remain attractive, consistent with established physics.

For now, antigravity remains firmly in the realm of theory rather than engineering.

Still, even confirming gravity’s quantum nature would represent one of the most significant breakthroughs in modern physics. It could finally bridge the gap between relativity and quantum mechanics, providing a foundation for discoveries that are difficult to imagine today.

Whether those discoveries eventually include practical antigravity machines remains uncertain. But the experiment itself could answer one of science’s oldest questions—and redefine how humanity understands the force that binds the universe together.

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