Teleportation already works in one very narrow sense: physicists routinely transfer the quantum state of a particle to another particle far away, instantly and without moving anything physical between them. But teleporting a person or even a visible object the way science fiction imagines it faces problems so extreme they border on impossible. Understanding why starts with what “teleportation” actually means in physics, and what it would take to scale that up.
What Quantum Teleportation Actually Does
Real teleportation, first demonstrated in a lab in 1997 by a team led by Anton Zeilinger, doesn’t move matter. It moves information. Specifically, it transfers the complete quantum state of one particle onto a distant particle, so the distant particle becomes an exact replica of the original’s state. The original particle loses its state in the process.
The trick relies on a phenomenon called entanglement. Two particles are prepared so their properties are linked: measuring one instantly determines the other, no matter how far apart they are. Einstein famously called this “spooky action at a distance.” To teleport a state, you start with a pair of entangled particles, one held locally and one at the destination. You then perform a specific measurement that entangles your local particle with the one carrying the state you want to send. That measurement produces a result (just two bits of ordinary information, like a pair of coin flips) that you send to the person at the destination through a normal communication channel. Using those two bits, the receiver adjusts their entangled particle, and it takes on the exact quantum state of the original.
Two things are critical here. First, the original state is destroyed during measurement. You can’t copy a quantum state; you can only move it. Second, you still need to send those two classical bits of information through conventional means, which travel at or below the speed of light. So quantum teleportation doesn’t allow faster-than-light communication. It allows something subtler: the faithful transfer of fragile quantum information that couldn’t survive being sent directly.
How Far It Works Today
In 2017, China’s Micius satellite distributed entangled photon pairs to two ground stations 1,200 kilometers apart, confirming entanglement over that record distance. The same satellite program demonstrated teleporting a quantum state from a ground observatory up to the orbiting satellite. On the ground, researchers at Northwestern University showed in 2024 that quantum teleportation can work over existing fiber-optic cables that simultaneously carry normal internet traffic, a milestone for practical deployment.
These experiments teleport the state of a single photon. That’s useful for building ultra-secure communication networks, because the information transferred via teleportation can’t be intercepted without destroying it. Quantum teleportation is a core building block of a future “quantum internet” where entanglement is distributed between distant nodes, enabling secure key exchange and distributed quantum computing. Researchers are now working on entanglement swapping, using two pairs of entangled photons to extend quantum connections across even longer distances without dedicated fiber.
Why Teleporting Objects Is a Different Problem Entirely
Scaling from one photon’s state to an actual physical object requires a leap so vast it’s hard to overstate. To teleport a person in the sci-fi sense, you’d need to do two things: capture the complete physical state of every particle in their body, and then reconstruct that exact arrangement somewhere else using local raw materials.
The first problem is measurement. A core rule of quantum mechanics, the Heisenberg uncertainty principle, says you cannot simultaneously know a particle’s exact position and exact momentum. This isn’t a limitation of instruments; it’s a property of nature itself. No technology, no matter how advanced, can fully scan every particle in a complex object without disturbing those particles in the process. You’d need to measure trillions of trillions of atoms, capturing not just where they are but how they’re moving, how they’re bonded, and what quantum states they’re in.
The second problem is data. A group of physics students at the University of Leicester estimated that the information content of a single human cell is roughly 10 billion bits. That sounds manageable until you account for the brain, where the precise arrangement of connections matters enormously. The total information content of a human being, including the brain’s structure, comes to roughly 2.6 × 10⁴² bits. For scale, the entire global data storage capacity today is somewhere around 10²³ bits. You’d need more storage than currently exists on Earth by a factor of about a billion billion.
The Time and Energy Problem
Even if you could scan and store all that data, transmitting it would take an absurd amount of time. Using a bandwidth in the 30 GHz range (comparable to high-end satellite communications), the same Leicester calculations found the transfer would take approximately 4.85 × 10¹⁵ years. That’s about 350,000 times the current age of the universe. You could reduce the time by increasing bandwidth, but the energy cost scales up in lockstep. Compressing the transfer into any reasonable timeframe would require more energy than human civilization produces.
And this is just the information transfer. It doesn’t account for the energy needed to disassemble a person atom by atom at the origin, or to assemble them atom by atom at the destination, placing each of roughly 7 × 10²⁷ atoms in precisely the right position and quantum state.
The Identity Problem
Suppose all the engineering problems were solved. A deeper question remains: would the person who appears at the destination actually be you?
The philosopher Derek Parfit posed this as a thought experiment. Imagine a machine scans your entire molecular structure, transmits the data to Mars, and a second machine rebuilds you from local carbon, hydrogen, oxygen, and other elements in the exact same arrangement. The original body is destroyed during scanning. The person on Mars has your memories, your personality, your sense of being you. From their perspective, they stepped into the machine on Earth and stepped out on Mars. But from the original’s perspective, the experience ends at the scan. You never experience arriving.
The paradox sharpens if you imagine the machine is improved so it no longer destroys the original. Now there are two of you, both with identical memories, both convinced they’re the real one. If the machine can make ten copies, there are ten. The Polish writer Stanisław Lem explored this same scenario and pointed out that each copy would naturally claim to be a continuation of the original, but the original’s experience never includes “arriving” anywhere. Teleportation, from the original’s viewpoint, is indistinguishable from death followed by the creation of a perfect duplicate.
Parfit’s conclusion was that personal identity is less concrete than we assume. What matters, he argued, is psychological continuity: memory, personality, the felt sense of connection to your past self. If the copy has all of that, the question of whether it’s “really” you may not have a meaningful answer. But most people find that conclusion deeply unsatisfying when it’s their own body in the machine.
What Teleportation Will Likely Become
The version of teleportation that has a practical future is the quantum information kind. Within the next decade or two, quantum teleportation is expected to form the backbone of quantum networks, enabling secure communication that’s physically impossible to eavesdrop on and connecting quantum computers across cities or continents. The Northwestern experiment showed this can happen over ordinary fiber-optic cables already in the ground, which removes the need for expensive dedicated infrastructure.
Teleporting matter, though, remains firmly in science fiction. The barriers aren’t engineering problems waiting for better technology. They’re rooted in fundamental physics: the uncertainty principle limits what can be measured, the information content of even a simple organism dwarfs anything we can process, and the energy requirements are civilization-scale. If it ever becomes possible, it would require physics we don’t currently have.