Gravity is the force with which we’re most familiar. It’s what’s keeping you on the planet, even as you’re reading this. Despite gravity feeling deeply intertwined with our daily lives, scientists are still unable to quantize it—or test general relativity (our best theory of gravity) and quantum physics in a single experiment.
This is, without a doubt, the biggest open problem in physics at present. But one experiment could change that—and unlock a new theory of physics with mind-blowing applications.
This is the BVM experiment. My colleague Chiara Marletto (the M in the experiment’s title) and I—and, independently, Sougato Bose (the “B”)—proposed an idea for testing the quantum nature of gravity even with objects far smaller than the Earth; ones that are roughly the size of a biological cell, or perhaps a bit smaller.
We suggest placing two masses in a superposition—or the quantum property of simultaneously being in many states—of two locations each. If gravity is quantum, the two masses would then become entangled, meaning their positions would be intertwined. We would then see four distinct ripples in the gravitational field, two for each mass. If instead gravity were classical, there would be no entanglement, and thus only one ripple for each mass.
Think of it in terms of dropping beach balls into a swimming pool. Here, our superposed mass would be the ball and the gravitational field would be the pool’s surface. Drop the beach ball and you would see waves in both the deep and shallow ends of the pool—if gravity truly is quantum, that is. With two quantum balls there would be four ripples, leading to them being entangled.
Imagine the BMV experiment is performed and entanglement confirmed—suggesting that gravity is quantum. What practical applications could this result have? Well, for starters, we could build quantum computers using gravity. Given that black holes pack more information than any other known object in the universe, perhaps we could one day use them as the ultimate quantum supercomputers. However, there is another possibility that sounds even more science-fictional.
Gravity is the weakest of our four fundamental forces—the other three being electromagnetism and the strong and weak nuclear forces. Gravity is unusual among forces, not only because of its weakness, but also because it’s always attractive between all objects. In other words it acts as a universal glue. That’s exactly what keeps us stuck to Earth, keeps Earth in orbit around the sun, and keeps the sun in its own orbit around the center of our Galaxy, and so on. But gravity’s quantum nature could actually be used to make gravity repulsive. This is my latest work with Marletto and another colleague, Pablo Saldanha, in which we designed an antigravity machine.
The machine works similarly to the BMV experiment. Imagine that one of the two gravitating masses (the “source”)—or a beach ball, in terms of our layman’s experiment—is in a superposition of states, while the other (the “probe”) is localized in one place. In the part of the superposition where the source is closer to the probe, the gravitational attraction is stronger. Meanwhile, in the other part where the source is farther away from the probe, the gravitational attraction is weaker. In both branches, the force of gravity is still attractive, so how do we make this into repulsion?
For starters, every quantum experiment has three parts:
It’s this last part that gives us the repulsion, but it only does so for one of the outcomes of the final measurement. So what matters is the post-selection; we have anti-gravity only if the right outcome is observed. On average, if both outcomes are included, gravity is always attractive, just as it is in the classical world. So, we need to discard one of the outcomes of the final measurement, which is what gives us repulsion.
While some might argue that anything can happen if we post-select—or observe the most favorable outcome—that isn’t necessarily the case. Indeed, discarding “bad” outcomes (such as those where the particles attract) leads us to observe what we want (in this case, repulsion). However, classically, this isn’t possible, no matter how much we post-select. If our experiment is confirmed, it would therefore show that gravity can act from two different points on the source at the same time. In other words, only if gravity is quantum could we have an antigravity machine.
How realistic are the BMV and antigravity experiments to perform? Pretty difficult. Luckily, a number of world-leading quantum groups are racing to implement these experiments, and I’m optimistic that we will have conclusive results in the early 2030s. Even more excitingly, I am collaborating with Marletto and my Italian colleagues Marco Genovese, Fabrizio Piacentini, and Ettore Bernardi, who are wizards in the lab, to try to get there first. We are on the cusp of solving one of the biggest mysteries of physics, and, as a bonus, might be able to develop technology that even renowned science-fiction writer Arthur C. Clarke couldn’t have imagined.
February / March 2026
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Featuring:
➡ Archaeologists Found a Skeleton Wearing a Silver Amulet. The Discovery Is Rewriting the History of Christianity.
➡ The Stray Dogs of Chernobyl Are Rapidly Mutating. Scientists Are Still Trying to Figure Out What It Means.
➡ New Evidence Could Upend What We Know About the Charles Lindbergh Baby Murder
➡ Police Found Mysterious Notes in a Dead Man's Pocket. They Turned Out to Be Codes That Not Even the FBI Can Break.
December 2025 / January 2026
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Featuring:
➡ An Angel of Death Preyed on Hospital Patients for Years.
➡ How America's Most Advanced Lab Brought the Killer to Justice.
➡ A 3,000-Ton Locomotive Was Loose, Unstoppable, and Filled With Toxic Cargo
➡ An Underwater Cave Promised Adventure and Glory. No One Expected It to Become a Tomb.
➡ Your Consciousness Can Predict the Future, Some Scientists Say
October / November 2025
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Featuring:
➡ Inside the Secret Island Where Death Is Optional
➡ A Legendary Ship Sank Without Warning. Fifty Years Later, Science Could Finally Solve the Mystery of the Edmund Fitzgerald.
➡ This Tech Rebel Threw Away $900 Million in a Municipal Dump. Can Robots Find His Lost Fortune?
➡ Sex Workers, LSD, and Mind Control: What Happened in the CIA's Lab of Nightmares at 225 Chestnut Street
August / September 2025
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Featuring:
➡ The Worst Air Disaster in American History Happened in Broad Daylight. Will More Mistakes Keep Happening?
➡ NASA Has a Plan to Save Earth from Planet-Destroying Asteroids. It Sounds Even Wilder than Science Fiction.
➡ A Naval Officer Says Underwater UFOs Are Legitimate Threats. The Evidence Is Hard to Ignore.
➡ When You Die, a Psychedelic Molecule Shapes Your Final Moments of Consciousness, a New Theory Reveals.
June/July 2025
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Featuring:
➡ This Undersea Explorer Found America's Greatest Sunken Treasure. Then Things Got Really Weird.
➡ Is Bigfoot Hiding in the Swamps of Florida? This Group Says It Has Proof.
➡ Scientists May Have Gotten the Global-Warming Timeline Seriously Wrong.
➡ A Third State Now Exists Between Life and Death, Some Scientists Now Believe
April/May 2025
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Featuring:
➡ Scientists Successfully Revive a Dead Brain, Redefining the Boundary Between Life and Death
➡ Fingerprints Keep Leading to Wrongful Convictions. Why Do Courts Still Rely on Them?
➡ For 80 Years, the North Sea Held a Deadly Killer. Now Scientists Are Racing to Defuse the Threat.
➡ They Built the Quietest Room in the World. Why Is Everyone So Afraid to Step Inside It?
February/March 2025
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Featuring:
➡ This Guy Says He Knows the Truth About UFOs. Should We Believe Him?
➡ Scientists Are Now One Step Away From Solving Nuclear Fusion—And Unlocking Unlimited Energy.
➡ A Million-Dollar Heist Rocked the Art World— Then Amateur Sleuths Cracked the Case
➡ A New Era of Missile Warfare Has Begun—and the U.S. Isn’t Ready
December/January 2025
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Featuring:
➡ A Clue Hidden in a 400-Year-Old Map Might Have Just Solved One of America's Greatest Mysteries
➡ Inside the Deranged Plot to Smuggle Cocaine With an Armed Soviet-Era Submarine
➡ This Brilliant Engineer Helped Build the B2 Bomber—Then He Sold America's Stealth Secrets to China
➡ Your Consciousness Can Connect With the Whole Universe
October/November 2024
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Featuring:
➡Untold Secrets Reveal How the Castle Bravo Test Became America’s Worst Nuclear Disaster
➡ This Body Was Found Preserved on a Block of Ice in a Colorado Shed. It Had Been There for 30 Years.
➡ It Was Supposed to Be America's Greatest Victory in Space—Then It Became NASA’s Worst Nightmare
➡ The Sidewinder Missile Ruled the Air—Then the Soviets Stole the Design
August/September 2024
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Featuring:
➡This Man Knows the Truth About Amelia Earhart. Why Doesn't Anyone Believe Him?
➡ The Army's Machine Gun Is No Match for Cheap Chinese Body Armor. So It's Making a New One.
➡ Russia Built a Stunning Rival to the Supersonic Concorde—and Then It Fell From the Sky
➡ A Navy Admiral Says Underwater UFOs Are a Threat—and the Pentagon is Withholding Secrets
June / July 2024
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Featuring:
➡4 Black Eggs Have Surfaced From the Depths of the Ocean— and the Mysterious Creatures Inside Are Baffling Science
➡ A $2 Million Treasure Appeared in a Kentucky Cornfield. No One Knows Where It Came From.
➡ A Million-Dollar Heist Rocked the Art World— Then Amateur Sleuths Cracked the Case
➡ A New Era of Missile Warfare Has Begun—and the U.S. Isn’t Ready
April May / 2024
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Featuring:
➡The Man Who Knows Too Much About Area 51
➡ How the FBI Took Down the Internet's Most Dangerous Website
➡ A Staggering New Clue Emerges in the D.B. Cooper Hijacking Mystery
➡ The Wildest Prison Break in U.S. History
➡ The Secret to a Perfect Lawn Lies in One of These 10 Electric Lawnmowers
February / March 2024
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Featuring:
➡The Incredible Mystery of NASA’s Missing Moondust
➡ Inside the Final Fiery Minutes of the East Palestine Train Wreck
➡ Scientists Believe They’ve Unlocked Consciousness—and It Connects to the Entire Universe
➡ Why This Unstoppable Stealth Bomber Will Rule the Skies
➡ America Is Developing a New Nuclear Bomb—But Can’t Test Whether It Works
➡ The 8 Best, Expert-Recommended Solar-Powered Generators
Special Issue: Nukes
➡ How Deadly Nuclear Waste Is Menacing This St. Louis Neighborhood
➡ The Terrifying History of Russia's Nuclear Submarine Graveyard
➡ Strange Mutations in Stray Dogs Near Chernobyl Suggest They Are Rapidly Evolving
➡ America Dumped 56 Million Gallons of Radioactive Material Along the Columbia River—Then It Started to Leak
December 2023 / January 2024
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Featuring:
➡ A New Clue In Amelia Earhart's Disappearance Emerges From the Ocean
➡ How an Alleged Water Bandit Stole $25 Million in Water from Thirsty California Farms
➡ A Coal Mine Exploded and 300 Miners Died. What Went Wrong?
➡ China Just Built a Terrifying New Aircraft Carrier and May Soon Dominate the Seas
October / November 2023
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Featuring:
➡ How Rats Took Over Our Cities—And Why We Can't Stop Them
➡ This Language Is on the Verge of Extinction. Can It Be Saved?
➡ America's Deadliest Warplane Returns in a New Doomsday Role
➡ This Amateur Diving Group Kept Solving Cold Cases. Then Its Own Skeletons Surfaced.
➡ The Scientific Breakthrough That Could Put an End to Gray Hair.
August/September 2023
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Featuring:
➡ Immortality Is in Reach. But It’s Not What We Imagined.
➡ Your Next iPhone (and Nuclear Subs) Will Be Powered By Space Metal
➡Scientists Now Think We Can Build a Warp Drive
➡ China and Russia Have Cracked the Stealth Code. Can the U.S. Regain Air Dominance?
June/July 2023
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Featuring:
➡ The CIA’s Secret Plan to Build a Laser Beam Powered by the Human Mind
➡ The 747 Ruled the Skies—Then One Slammed Into a Mountain
➡The Race to Contain AI Before Singularity
➡ These Florida Homes Aren’t Just Hurricane-Proof—They’re Blueprints for the Future
April/May 2023
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Featuring:
➡ AI Is on the Cusp of Taking Control—This Is How It May All Go Wrong
➡ There’s No Weapon Russia Fears More Than the HIMARS Rocket Launcher
➡The Nuclear-Submarine Arms Race Is Getting Intense, and the U.S. Just Took a Massive Leap Forward
➡ Iran Is Becoming a Drone Superpower—By Stealing American Technology
February/March 2023
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Featuring:
➡ The Greatest Treasure Hunt in American History Ended—and Then Things Got Weird
➡ These Are the High-Powered Weapons Ukraine Needs to Send Russia Running
➡ The Secret War to Take Out Iran’s Fleet of F-14 Jets
➡ Russia Is Trying to Intimidate the U.S. with Hypersonic Missiles and Big, Scary Nukes—And It's More Than a Threat
December 2022/January 2023
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Featuring:
➡ Is Death Real?
➡ China and Russia Are Dominating the Hypersonic Arms Race—And It’s Not Even Close
➡ When the South Fork Dam Broke, a Pennsylvania City Washed Away. Which Town Is Next?
➡ The Navy’s New $13 Billion Aircraft Carrier Is Already Obsolete. This Weapon Can Save It.
October/November 2022
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Featuring:
➡ Can America's M1 Abrams Still Compete With China's and Russia's Latest Battle Tanks?
➡ Inside the Final Minutes of the Concorde Disaster—and How It Doomed Supersonic Travel for Decades
➡ How the Massive Cargo Ship Felicity Ace Sank, Taking $400 Million Worth of Exotic Supercars With It
➡ I Turned My Old Gas-Guzzler Into a Zippy EV for $15,000
August/September 2022
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Featuring:
➡ Cosmic Secrets of the 17 Most Powerful Mega-Telescopes on Earth—and Beyond
➡ Can the Air Force's Secret, Hypersonic Jet Reclaim the Skies From Russia and China?
➡ For 50 Years, the Zodiac Killer's 340 Cipher Stumped the FBI—Then Three Amateurs Cracked the Code
➡ America's Most Fearsome Howitzer Has Entered the War in Ukraine
June/July 2022
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Featuring:
➡ Every Single Drone Fighting in the Skies Over Ukraine
➡ How to Buy a New Car in 2022 Without Getting Fleeced
➡ This Megastructure Could Keep Us Alive Forever
➡ The Race to Revolutionize EV Batteries
Vlatko Vedral is a professor of physics at the University of Oxford, known for both his theoretical and experimental work on quantum information, including developing a novel way of quantifying entanglement and applying it to macroscopic physical systems. When not studying the fundamental nature of reality, Vlatko enjoys drawing, wakeboarding, and playing his electric guitar "up to 11." He is the author of the 2010 book Decoding Reality, as well as the latest "Portals to A New Reality." Born in Serbia, he now lives in Oxford.
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