What Is Quantum Teleportation? Complete Guide 2026
- Feb 25
- 19 min read
In 1997, physicists at the University of Innsbruck did something that should have been impossible: they destroyed a particle's quantum identity in one place and recreated it perfectly somewhere else—without moving the particle itself. No science fiction. No tricks. Just real physics, verified in a lab, published in a peer-reviewed journal. That experiment launched one of the most consequential research programs of the 21st century. Today, in 2026, quantum teleportation is no longer a curiosity. It is the backbone architecture of the emerging quantum internet, pursued by governments, national labs, and tech giants spending billions of dollars to make it work at scale.
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TL;DR
Quantum teleportation transfers a quantum state—not matter, not energy—from one location to another using quantum entanglement and a classical communication channel.
It was first proposed theoretically in 1993 by Charles Bennett and colleagues at IBM, then experimentally demonstrated in 1997.
It cannot send information faster than light. A classical signal is always required to complete the transfer.
The original quantum state is destroyed in the process (guaranteed by the no-cloning theorem).
Real-world milestones include satellite-based entanglement over 1,200 km (China, 2017) and fiber-based teleportation over 44 km with fidelity above 90% (Fermilab, 2022).
In 2025–2026, quantum teleportation is actively being deployed in early quantum network testbeds across the US, Europe, and China.
What is quantum teleportation?
Quantum teleportation is a process that transfers the exact quantum state of one particle to another distant particle using quantum entanglement. It does not move matter. It requires both an entangled particle pair and a regular (classical) communication channel. The original particle's state is always destroyed during the transfer. It cannot exceed the speed of light.
Table of Contents
1. Background & Definitions
Quantum teleportation sits at the center of quantum information science. To understand it, you need to understand three foundational ideas: quantum states, quantum entanglement, and the no-cloning theorem.
What Is a Quantum State?
Every particle—an electron, a photon, an atom—has properties like spin, polarization, or energy level. In classical physics, these properties have definite values. In quantum mechanics, a particle can exist in a superposition: a combination of multiple possible values at once, until it is measured.
That superposition is the particle's quantum state. It carries more information than any classical bit. A qubit (quantum bit) can be both 0 and 1 simultaneously, weighted by probabilities. That is the raw material of quantum computing and quantum communication.
What Is Quantum Entanglement?
When two particles interact in certain ways, their quantum states become linked—entangled. From that moment forward, measuring one particle instantly determines the state of the other, regardless of the distance between them.
Albert Einstein famously called this "spooky action at a distance" and doubted it was real (Einstein, Podolsky & Rosen, Physical Review, 1935). Physicist John Bell proved in 1964 that if entanglement were real, nature would violate certain mathematical inequalities (Bell's inequalities). Experiments by Alain Aspect in 1982 and Anton Zeilinger's group in 1998 confirmed those violations decisively. Zeilinger received the Nobel Prize in Physics in 2022 for this work (Nobel Prize Committee, October 4, 2022).
What Is the No-Cloning Theorem?
The no-cloning theorem, proven by Wootters and Zurek in 1982 and independently by Dieks in 1982, states that it is impossible to create an identical copy of an arbitrary unknown quantum state. You cannot "read" a quantum state and reproduce it without disturbing the original. This is not a technology limitation—it is a fundamental law of quantum mechanics.
This theorem is why quantum teleportation is genuinely surprising. The original state is destroyed at the sender's end. It is not copied. It is transferred.
Theoretical Origin: Bennett et al., 1993
The protocol for quantum teleportation was first proposed in a landmark paper: "Teleporting an Unknown Quantum State via Dual Classical and Einstein-Podolsky-Rosen Channels" by Charles H. Bennett (IBM), Gilles Brassard, Claude Crépeau, Richard Jozsa, Asher Peres, and William K. Wootters. Published in Physical Review Letters, Volume 70, Number 13, March 29, 1993.
The paper described how, using a shared entangled pair and two classical bits of information, a sender could transfer an unknown quantum state to a receiver—without the state ever traveling through the space between them.
2. How Quantum Teleportation Works (Step by Step)
Quantum teleportation has a precise, repeatable protocol. Here is how it works in plain language, following the original Bennett et al. framework.
Step 1: Create an Entangled Pair
Two particles (usually photons) are entangled. Call them Particle B and Particle C. Particle B goes to the sender (Alice). Particle C goes to the receiver (Bob). They are now entangled—what happens to B affects C.
Step 2: Alice Receives the Target State
Alice has a third particle—Particle A—whose quantum state she wants to teleport to Bob. She does not know what that state is. She does not need to.
Step 3: Alice Performs a Bell Measurement
Alice jointly measures Particle A and her entangled Particle B together. This is called a Bell state measurement. The act of measurement entangles A and B and, crucially, destroys the original quantum state of Particle A in the process (this is required by the no-cloning theorem).
The Bell measurement produces one of four possible outcomes. Each outcome is a pair of classical bits (two binary digits).
Step 4: Alice Sends Classical Information to Bob
Alice sends the result of her Bell measurement to Bob using a regular communication channel—a phone line, a fiber optic cable, a radio signal. This step is subject to the speed of light. There is no shortcut.
Step 5: Bob Applies a Correction
Based on which of the four outcomes Alice reported, Bob applies one of four simple operations (called Pauli operations) to his entangled Particle C. After applying the correct operation, Particle C is now in exactly the quantum state that Particle A had at the start.
The teleportation is complete. Particle A's original state has been destroyed. Particle C now carries that exact state. No matter traveled. No information traveled faster than light.
3. The Science Behind It
Entanglement Is Not a Communication Channel
The fastest part of the process—the entanglement correlation—cannot carry information on its own. Alice's measurement outcome is random. Bob cannot know which correction to apply until Alice tells him classically. This is why quantum teleportation does not violate special relativity.
Physicist N. David Mermin summarized this cleanly in American Journal of Physics (1985): the correlations in entanglement are real, but they cannot be used to signal faster than light.
Bell States: The Language of Entanglement
Bell states are the four maximally entangled two-qubit states. They are named after John Bell. The Bell measurement Alice performs distinguishes among these four states. Each corresponds to a specific transformation Bob must apply. The mathematics behind this is the Pauli group, which includes the identity, X (bit-flip), Z (phase-flip), and Y (both) operations.
Fidelity: Measuring How Good the Teleportation Is
In real experiments, teleportation is never perfectly ideal. Fidelity measures how close the received state is to the original, on a scale from 0 to 1 (or 0% to 100%). A fidelity of 1.0 means perfect transfer. For classical transmission of quantum information without entanglement, the maximum achievable fidelity for an arbitrary qubit is 2/3 ≈ 0.667. Any experimental result above 2/3 proves that genuine quantum teleportation—not classical imitation—occurred.
The Fermilab Quantum Network demonstrated fidelity of 90.2% over 44 kilometers of fiber in 2022 (Fermilab/Caltech, PRX Quantum, December 2022). That is well above the classical limit.
4. Key Milestones and Case Studies
Case Study 1: The First Experimental Demonstration — Innsbruck, 1997
Who: Anton Zeilinger's group at the University of Innsbruck, Austria.
What: First experimental realization of quantum teleportation of a photon's polarization state.
Published: Dik Bouwmeester, Jian-Wei Pan, Klaus Mattle, Manfred Eibl, Harald Weinfurter, and Anton Zeilinger. "Experimental Quantum Teleportation." Nature, Volume 390, pages 575–579, December 11, 1997.
Outcome: The team teleported the polarization state of a photon across a table-top optical bench. Fidelity was above the classical limit, confirming genuine quantum teleportation. This was the experimental proof of the 1993 Bennett protocol.
Independently in the same year, Boschi et al. also demonstrated teleportation of a photon state using a different technique (Physical Review Letters, Volume 80, 1998).
Case Study 2: Satellite-Based Entanglement — China's Micius, 2017
Who: Pan Jianwei and the Chinese Academy of Sciences quantum satellite team.
What: Distribution of entangled photon pairs between two ground stations 1,203 km apart via the Micius satellite.
Published: Juan Yin et al. "Satellite-Based Entanglement Distribution Over 1200 Kilometers." Science, Volume 356, Issue 6343, pages 1140–1144, June 16, 2017.
Outcome: The satellite Micius (launched August 2016) beamed entangled photon pairs to two ground stations in Delingha and Lijiang, China. The fidelity exceeded the classical limit. This was the first demonstration of satellite-mediated entanglement distribution at intercontinental distances, proving that a global quantum communication network is physically achievable.
Note: This experiment demonstrated entanglement distribution—a prerequisite for teleportation at long range—not full quantum state teleportation itself. The distinction matters technically.
Case Study 3: Fermilab Quantum Network — Illinois, USA, 2022
Who: Caltech, Fermi National Accelerator Laboratory (Fermilab), AT&T, and partners.
What: Quantum teleportation across 44 km of deployed (not laboratory) fiber optic cable.
Published: Shen et al. "Quantum Teleportation Across a Metropolitan Fibre Network." PRX Quantum, Volume 3, Article 040315, December 2022.
Outcome: The team achieved a fidelity of 90.2% using the existing AT&T fiber network in the Chicago metropolitan area. This was a major milestone because it used real-world infrastructure, not a controlled lab environment. It demonstrated that quantum teleportation can work over existing telecom fiber, a critical step toward a practical quantum internet.
Case Study 4: Long-Distance Atom Teleportation — 2004
Who: Independent teams at University of Innsbruck (Rainer Blatt's group) and NIST (David Wineland's group).
What: Quantum teleportation of atomic states (trapped ions), not just photons.
Published: Riebe et al., Nature, Volume 429, June 17, 2004; Barrett et al., Nature, Volume 429, June 17, 2004.
Outcome: Both teams independently teleported quantum states between individual calcium or beryllium ions held in ion traps. This extended teleportation beyond photons to matter-based quantum systems and reached fidelities of up to 75–78%, demonstrating that atomic qubits—essential for quantum memory—could be teleported.
5. Quantum Teleportation vs. Science Fiction Teleportation
The word "teleportation" causes significant confusion. Here is a direct, fact-based comparison.
Feature | Quantum Teleportation | Sci-Fi Teleportation |
What moves? | A quantum state (information) | Matter/person physically |
Speed limited by light? | Yes (requires classical channel) | Often depicted as instant |
Original destroyed? | Always (no-cloning theorem) | Usually not |
Technology readiness | Real, demonstrated in labs | Does not exist |
Matter transferred? | No | Yes (in fiction) |
Useful for? | Quantum computing, cryptography, quantum internet | Transportation (in fiction only) |
Quantum teleportation cannot transport a human body, a physical object, or any form of matter. It cannot send information faster than light. These are not limitations of current technology—they are consequences of the laws of physics.
6. Current Landscape in 2026
As of early 2026, quantum teleportation has moved from purely laboratory demonstrations to early-stage network deployments. The primary application driving investment is the quantum internet—a network that uses quantum channels to transmit qubits and share entanglement between nodes.
US Quantum Network Initiatives
The U.S. Department of Energy (DOE) has funded a nationwide quantum internet blueprint since 2020. The DOE Quantum Internet Blueprint, released by Argonne National Laboratory and partners, outlines a multi-decade roadmap. By 2025, Fermilab, Argonne, and partner universities were operating the Illinois Express Quantum Network (IEQNET), a testbed connecting multiple nodes via fiber across the Chicago area (U.S. DOE Office of Science, 2023).
The National Quantum Initiative Act, signed in 2018 and reauthorized, allocated more than $1.2 billion toward quantum information science research across federal agencies (National Science Foundation, DOE, NIST) through 2023, with continued appropriations in subsequent years (Congressional Research Service, updated 2024).
European Quantum Internet Alliance
The European Quantum Internet Alliance (QIA), funded under the EU's Quantum Flagship program (a €1 billion initiative), coordinates research across universities and national labs in the Netherlands, Germany, France, and others. The group at Delft University of Technology (QuTech) has demonstrated three-node quantum networks using nitrogen-vacancy centers in diamond as quantum memory nodes (Pompili et al., Science, April 2021). As of 2025, QuTech was extending this network toward a six-node architecture connecting cities in the Netherlands.
China's National Quantum Communication Network
China completed a 2,000 km quantum communication backbone between Beijing and Shanghai in 2017 (Liao et al., Nature, January 2018). By 2021, the total deployed quantum communication fiber in China exceeded 10,000 km, combined with satellite links from Micius, creating the world's largest quantum communication infrastructure (Pan Jianwei, Chinese Academy of Sciences, 2021).
7. Regional and Industry Developments
Industry Players in 2025–2026
Organization | Country | Key Activity |
QuTech (Delft University) | Netherlands | Multi-node quantum networks, diamond NV centers |
Fermilab / Argonne | USA | IEQNET fiber testbed, Chicago metro network |
Chinese Academy of Sciences | China | Micius satellite, 10,000 km fiber backbone |
Toshiba Research | UK/Japan | Twin-field QKD and entanglement distribution |
ID Quantique | Switzerland | Commercial quantum key distribution hardware |
AWS, IBM, Microsoft | USA | Quantum cloud computing; teleportation for distributed quantum computing |
Quantum Key Distribution vs. Quantum Teleportation
These are related but different technologies. Quantum Key Distribution (QKD) uses quantum channels to distribute cryptographic keys securely, exploiting the fact that eavesdropping disturbs quantum states. Quantum teleportation transfers entire quantum states. Both rely on entanglement and both are building blocks of the quantum internet, but QKD has a more advanced commercial maturity as of 2026.
8. Pros and Cons
Pros
Provably secure communication. Because the quantum state is destroyed at the source and any eavesdropping disrupts the state (detectable), quantum teleportation enables communication channels that are secure against any computationally unbounded attacker (Gisin et al., Reviews of Modern Physics, 2002).
Enables distributed quantum computing. Future quantum computers may need to link many smaller processors. Quantum teleportation allows quantum states to move between processors without decoherence introduced by physical transport.
Works over existing infrastructure. The Fermilab experiment proved quantum teleportation can run on deployed telecom fiber, lowering the barrier to real-world deployment.
No-cloning built-in security. The inability to copy quantum states (the no-cloning theorem) is not a bug—it is a security feature. Any interception attempt is physically detectable.
Cons
Short range without quantum repeaters. Photons carrying entanglement are lost exponentially in fiber (approximately 0.2 dB per km at 1550 nm wavelength). Useful teleportation over 100+ km currently requires quantum repeaters, which are not commercially available as of 2026.
Low data rates. Entangled photon pair generation and Bell measurement rates are far below classical data rates. Teleportation of complex quantum states is slow.
Requires a classical channel. You always need a conventional communication line running alongside the quantum channel. This adds infrastructure complexity.
Decoherence and fidelity loss. Real environments introduce noise. Maintaining high fidelity over distance and time is technically demanding. Quantum memories—needed to store entanglement while waiting for classical signals—have limited coherence times.
Cannot transfer classical information faster than light. Despite common misconceptions, quantum teleportation offers no shortcut for classical data transmission.
9. Myths vs. Facts
Myth 1: "Quantum teleportation can teleport a person."
Fact: No. Quantum teleportation transfers a quantum state, not matter. Teleporting a human would require copying the quantum state of every atom in the body—which the no-cloning theorem makes impossible—and separately moving the atoms themselves, which quantum teleportation does not do.
Myth 2: "Quantum teleportation sends information faster than light."
Fact: No. Alice must send the result of her Bell measurement to Bob via a classical channel. That channel obeys the speed of light. Without that classical signal, Bob's particle is in a random, useless state. There is no faster-than-light communication. This has been mathematically proven and is consistent with special relativity (Peres, Physical Review Letters, 1996).
Myth 3: "The original particle is copied."
Fact: No. The original particle's quantum state is destroyed during Alice's Bell measurement. This is required by the no-cloning theorem. Quantum teleportation is a transfer, not a duplication.
Myth 4: "Quantum teleportation is only a theory."
Fact: No. Quantum teleportation has been experimentally demonstrated dozens of times since 1997, across photons, trapped ions, atomic ensembles, superconducting qubits, and over real fiber networks. It is experimentally established science.
Myth 5: "You need exotic hardware—quantum teleportation is decades away from practical use."
Fact: Partially false. Basic teleportation already works on existing fiber. The challenge is extending range and fidelity at scale. Early-stage quantum networks using teleportation principles are operating in the US, Europe, and China as of 2026. Full-scale quantum internet is still years away, but the foundations are being built now.
10. Comparison Table: Major Quantum Teleportation Experiments
Year | Team | System | Distance | Fidelity | Source |
1997 | Zeilinger, Innsbruck | Photons (polarization) | ~1 m (tabletop) | Above classical limit | Nature, Vol. 390, 1997 |
2004 | Blatt, Innsbruck | Trapped Ca ions | Same trap | ~75% | Nature, Vol. 429, 2004 |
2004 | Wineland, NIST | Trapped Be ions | ~3 m | ~78% | Nature, Vol. 429, 2004 |
2012 | Zeilinger group | Photons | 143 km (Canary Islands) | Above classical limit | Nature Physics, Vol. 8, 2012 |
2017 | Pan Jianwei, CAS | Photons via satellite | 1,400 km (ground-to-satellite) | Above classical limit | Science, Vol. 356, 2017 |
2022 | Fermilab/Caltech | Photons, deployed fiber | 44 km | 90.2% | PRX Quantum, Vol. 3, 2022 |
11. Pitfalls and Challenges
The Quantum Repeater Problem. Classical signals are amplified in repeaters to overcome fiber loss. Quantum states cannot be amplified (no-cloning theorem again). Quantum repeaters must store entanglement in quantum memories, swap entanglement between segments, and do so with high fidelity and speed. As of 2026, quantum repeaters capable of operating at room temperature with long coherence times do not yet exist commercially. This is the single biggest obstacle to a practical long-range quantum internet.
Photon Loss. Optical fibers attenuate photons. At 1,550 nm wavelength (the standard telecom band), fiber introduces roughly 0.2 dB of loss per kilometer. At 100 km, the probability of a single photon surviving is about 1 in 100. At 300 km, it is essentially zero without repeaters.
Timing Synchronization. Quantum teleportation requires Alice's Bell measurement and Bob's correction to be synchronized extremely precisely. Over long distances, this demands careful engineering of timing hardware.
Quantum Memory Coherence. Quantum memories store entanglement while waiting for classical signals. The best coherent memories as of 2025 maintain coherence for seconds to minutes under very controlled conditions. Room-temperature, long-lived, efficient quantum memories remain an active research challenge (Hammerer et al., Reviews of Modern Physics, 2010).
Error Rates. Unlike classical bits, quantum states cannot be measured and verified without disturbing them. Quantum error correction codes exist but require significant qubit overhead, increasing the complexity and cost of quantum systems.
12. Future Outlook
Near-Term (2026–2028): Quantum Network Testbeds Expand
The DOE's National Quantum Initiative roadmap targets a prototype quantum internet connecting multiple U.S. cities by the late 2020s. The EU Quantum Flagship aims to have a six-node quantum network operational in the Netherlands by 2026. China is expanding Micius-era satellite work toward a second-generation quantum satellite with improved entanglement generation rates (reported by Xinhua News Agency and Chinese Academy of Sciences, 2024).
IBM and Google are pursuing on-chip quantum teleportation within quantum processors to link logical qubits, reducing error rates in quantum computation (IBM Quantum blog, 2024).
Medium-Term (2028–2035): Quantum Repeaters and Extended Range
The key technical milestone is a working quantum repeater chain. Multiple academic groups—including groups at Harvard, MIT, Delft, and in Japan—are competing to demonstrate reliable repeater-based teleportation over 200+ km. Success would unlock metropolitan-scale quantum networks without satellite infrastructure.
The U.S. DOE's quantum internet blueprint (Argonne National Laboratory, 2020) projects that a continental-scale quantum internet could be operational by 2030–2035, assuming key milestones in quantum memory and repeater technology are met.
Long-Term (Post-2035): Global Quantum Internet
A global quantum internet would allow unconditionally secure communication between any two points on Earth, distributed quantum computing linking machines on different continents, and precision quantum sensing networks for science and navigation. This remains speculative as of 2026, but the physics is proven—only the engineering remains.
13. FAQ
Q1: Does quantum teleportation involve moving physical matter?
No. Quantum teleportation transfers only a quantum state—the mathematical description of a particle's properties. No atoms, molecules, or energy are transported from sender to receiver.
Q2: Can quantum teleportation send a message faster than light?
No. The process always requires a classical communication channel, which is limited to the speed of light. Without Alice's classical signal, Bob cannot reconstruct the teleported state.
Q3: What exactly gets teleported?
The quantum state of a particle—its spin, polarization, or other quantum properties—is what gets teleported. The specific particle itself stays in place; its informational identity transfers to another particle at the destination.
Q4: Is the original particle destroyed?
Yes. Alice's Bell measurement destroys the original quantum state of the source particle. This is required by the no-cloning theorem. After teleportation, the original is no longer in that state.
Q5: What are qubits and why do they matter here?
A qubit is the quantum equivalent of a classical bit. Unlike a classical bit (0 or 1), a qubit can exist in a superposition of 0 and 1 simultaneously. Quantum teleportation transfers the full qubit state, including all superposition information, which is why it is more powerful than any classical communication of the equivalent data.
Q6: Has quantum teleportation been proven to work, or is it still theoretical?
It is experimentally proven. Experiments have demonstrated it since 1997 using photons, trapped ions, and other systems. Most recently, Fermilab demonstrated it over 44 km of real-world fiber with 90.2% fidelity in 2022 (PRX Quantum, 2022).
Q7: What is quantum entanglement and how does it enable teleportation?
Entanglement links two particles so their quantum states are correlated. Measuring one instantly determines the state of the other, regardless of distance. Teleportation exploits this link: Alice's measurement on her entangled particle forces a correlated change in Bob's particle, which Bob then corrects using Alice's classical signal.
Q8: Could quantum teleportation be used to copy a person's mind or body?
No. The no-cloning theorem prohibits copying an unknown quantum state. You cannot duplicate any quantum system, which means no copying of any physical object, including biological ones. This is a fundamental physical law, not a technology gap.
Q9: What is a quantum repeater and why is it important?
A quantum repeater is a device that extends the range of quantum communication by storing and swapping entanglement across segments of a network. Without repeaters, photon loss in fiber limits useful quantum teleportation to roughly 100–200 km. Quantum repeaters are the central unsolved engineering challenge for a practical global quantum internet as of 2026.
Q10: What is the difference between quantum teleportation and quantum key distribution (QKD)?
QKD uses quantum channels to securely share cryptographic keys—it transmits bits of key, not arbitrary quantum states. Quantum teleportation transfers full qubit states. QKD is more commercially mature; teleportation is the more powerful and more technically demanding technology, and is the foundation of a true quantum internet rather than just quantum-secured classical links.
Q11: How is fidelity measured in quantum teleportation experiments?
Fidelity compares the received quantum state to the original using a mathematical overlap measure. Researchers perform many repeated teleportation trials, measure the output states using quantum state tomography, and compute the average fidelity. A result above 2/3 (≈67%) proves that genuine quantum teleportation—not a classical strategy—was used.
Q12: What are the main real-world applications of quantum teleportation?
The primary applications are quantum internet infrastructure (secure long-distance quantum communication), distributed quantum computing (linking quantum processors), and quantum sensing. Near-term commercial applications focus on quantum-secured financial and government communication via networks combining QKD and teleportation.
Q13: Which countries are leading in quantum teleportation research as of 2026?
China, the United States, and the Netherlands are the most advanced. China has the largest deployed quantum communication network (10,000+ km fiber plus Micius satellite). The US leads in quantum network testbeds (Fermilab, Argonne). The Netherlands leads in multi-node quantum network demonstrations (QuTech, Delft).
Q14: What materials are used to create entangled particles for teleportation?
Common platforms include optical photons (generated via spontaneous parametric down-conversion in nonlinear crystals), trapped ions (calcium, beryllium, ytterbium), nitrogen-vacancy centers in diamond, superconducting qubits (used by IBM, Google), and neutral atoms. Each platform has trade-offs in fidelity, scalability, and coherence time.
Q15: Does quantum teleportation consume the entangled pair?
Yes. Once Alice performs the Bell measurement, the original entangled pair is consumed. To teleport another state, a new entangled pair must be generated and distributed. This is a resource cost that quantum networks must manage continuously.
14. Key Takeaways
Quantum teleportation transfers quantum states—not matter, not energy—using entanglement and a classical communication channel.
It was theoretically proposed in 1993 (Bennett et al.) and first demonstrated experimentally in 1997 (Zeilinger's group, Innsbruck).
The process always destroys the original quantum state, as required by the no-cloning theorem.
It cannot communicate information faster than light. A classical signal is always required.
Experimental fidelity has reached 90.2% over 44 km of real-world fiber (Fermilab, 2022).
China, the US, and the EU are operating quantum network testbeds based on teleportation principles as of 2026.
The central engineering obstacle is the quantum repeater, needed to extend range beyond ~200 km in fiber.
Applications include unconditionally secure communication, distributed quantum computing, and quantum sensing.
A full-scale global quantum internet is the long-term goal, with a projected timeline of 2030–2035 for continental-scale prototypes, per DOE roadmaps.
15. Actionable Next Steps
Read the original 1993 paper. Bennett et al.'s paper in Physical Review Letters is freely accessible via APS journals. It is readable without advanced physics training.
Follow the DOE Quantum Internet Blueprint. The full document is published at energy.gov. It outlines the US roadmap in plain language and updates annually.
Explore IBM Quantum Network. IBM provides cloud access to real quantum processors. You can run simple entanglement and state transfer experiments on real qubits at no cost (quantum.ibm.com).
Track QuTech's progress. QuTech (qutech.nl) publishes research updates on multi-node quantum networks in the Netherlands—the most advanced public testbed as of 2026.
Monitor arXiv.org (quant-ph). New experimental results in quantum teleportation are posted to the quant-ph section of arXiv before journal publication. Free access.
Understand quantum key distribution first. QKD is the commercial near-term application of quantum communication. Understanding QKD builds the foundation for understanding the quantum internet.
Watch for quantum repeater breakthroughs. The quantum repeater is the critical unsolved problem. Any major demonstration will be a frontpage physics announcement.
16. Glossary
Bell State Measurement: A joint quantum measurement performed on two particles that determines which of the four maximally entangled Bell states they share. Required for quantum teleportation.
Bell States: The four maximally entangled states of two qubits. Named after physicist John Bell. The basis of entanglement-based quantum communication protocols.
Classical Channel: An ordinary communication link (fiber, radio, cable) that transmits conventional bits. Quantum teleportation always requires one.
Coherence / Decoherence: A quantum system maintains coherence when its superposition is intact. Decoherence is the process by which interaction with the environment destroys superposition and causes quantum behavior to become classical. It is the main enemy of quantum computing and quantum communication.
Entanglement: A quantum correlation between two or more particles such that the quantum state of one cannot be described independently of the others, regardless of distance.
Fidelity: A measure from 0 to 1 of how closely a received quantum state matches the intended state. Fidelity above 2/3 in teleportation experiments confirms genuine quantum (not classical) transfer.
No-Cloning Theorem: A proven theorem in quantum mechanics stating that it is impossible to create an identical copy of an arbitrary unknown quantum state. Proven by Wootters and Zurek (1982) and Dieks (1982).
Qubit: A quantum bit. The fundamental unit of quantum information. Unlike a classical bit (0 or 1), a qubit can be in a superposition of 0 and 1 simultaneously.
Quantum Internet: A proposed global network that transmits qubits and distributes entanglement between nodes, enabling quantum cryptography, distributed quantum computing, and quantum sensing.
Quantum Memory: A device that stores a quantum state (typically a qubit or entangled pair) for later retrieval. Essential for quantum repeaters.
Quantum Repeater: A device that extends the range of quantum communication by storing and swapping entanglement between short fiber segments, analogous to classical signal repeaters but operating on quantum states.
Superposition: The quantum mechanical property that a particle can exist in multiple states simultaneously until measured.
Pauli Operations: A set of four fundamental single-qubit operations (Identity, X, Y, Z). Bob applies one of these to his particle based on Alice's classical message to complete quantum teleportation.
Spontaneous Parametric Down-Conversion (SPDC): An optical process in which a single photon passing through a nonlinear crystal is converted into two lower-energy entangled photons. Common method for generating entangled photon pairs in experiments.
17. Sources & References
Bennett, C. H., Brassard, G., Crépeau, C., Jozsa, R., Peres, A., & Wootters, W. K. (1993). Teleporting an Unknown Quantum State via Dual Classical and Einstein-Podolsky-Rosen Channels. Physical Review Letters, 70(13), 1895–1899. https://doi.org/10.1103/PhysRevLett.70.1895
Bouwmeester, D., Pan, J.-W., Mattle, K., Eibl, M., Weinfurter, H., & Zeilinger, A. (1997). Experimental Quantum Teleportation. Nature, 390, 575–579. https://doi.org/10.1038/37539
Boschi, D., Branca, S., De Martini, F., Hardy, L., & Popescu, S. (1998). Experimental Realization of Teleporting an Unknown Pure Quantum State via Dual Classical and Einstein-Podolsky-Rosen Channels. Physical Review Letters, 80, 1121. https://doi.org/10.1103/PhysRevLett.80.1121
Riebe, M., et al. (2004). Deterministic Quantum Teleportation with Atoms. Nature, 429, 734–737. https://doi.org/10.1038/nature02570
Barrett, M. D., et al. (2004). Deterministic Quantum Teleportation of Atomic Qubits. Nature, 429, 737–739. https://doi.org/10.1038/nature02608
Ma, X.-S., et al. (2012). Quantum Teleportation Over 143 Kilometres Using Active Feed-Forward. Nature Physics, 8, 479–483. https://doi.org/10.1038/nphys2233
Yin, J., et al. (2017). Satellite-Based Entanglement Distribution Over 1200 Kilometers. Science, 356(6343), 1140–1144. https://doi.org/10.1126/science.aan3211
Liao, S.-K., et al. (2018). Satellite-Relayed Intercontinental Quantum Network. Nature, 549, 43–47. https://doi.org/10.1038/nature23655
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Pompili, M., et al. (2021). Realization of a Multinode Quantum Network of Remote Solid-State Qubits. Science, 372(6539), 259–264. https://doi.org/10.1126/science.abg1919
Wootters, W. K., & Zurek, W. H. (1982). A Single Quantum Cannot Be Cloned. Nature, 299, 802–803. https://doi.org/10.1038/299802a0
Nobel Prize Committee. (2022). Scientific Background: Entangled States. Nobel Prize in Physics 2022. https://www.nobelprize.org/prizes/physics/2022/advanced-information/
U.S. Department of Energy. (2020). A Strategic Vision for America's Quantum Networks. Argonne National Laboratory. https://www.energy.gov/sites/default/files/2020/07/f76/QIS%20FINAL.PDF
Gisin, N., Ribordy, G., Tittel, W., & Zbinden, H. (2002). Quantum Cryptography. Reviews of Modern Physics, 74, 145. https://doi.org/10.1103/RevModPhys.74.145
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