Scientists achieve teleportation with quantum supercomputer
www.independent.co.ukBreakthrough brings quantum computing closer to large-scale practical use
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Important note: this is about quantum teleportation. They transferred data between two quantum computers without a cable or wifi. Teleporting matter, let alone matter in useful quantities is far off.
Thatâs not entirely correct, they did use a fiber optic cable to transfer the data, as the more detailed article linked in another comment states. Quantum entanglement itself canât be used to transfer data; you still need to send the entangled particles through some physical means.
So what is being teleported? The state of the two entangled particles?
This highlights the problem with using that term. The two particles assume a state at the same time at a distance. It has 0% to do with the colloquial term.
Yes. Information is whatâs being teleported. The photons that carry the information still have to travel from sender to recipient but the information they contain doesnât exist until it is received. Like how Shrodingerâs Cat is both alive and dead until you open the box to check.
I see. that makes more sense, thanks!
No problem! I love getting into the comments under articles on quantum stuff 'cuz the topic is weirdly unintuitive from the classical perspective and a lot of folks share some common misconceptions about jargon like âteleportationâ and âentanglementâ. Please do ask if youâve got any other questions! đ
So, Bluetooth?
nah, bluetooth and wifi both use electromagnetic radiation. I didnât read the article and I understand nothing about quantum mechanics, but I donât think they use photons in this. someone correct me if Iâm wrong.
Allow me to oversimplify for the sake of understanding:
Quantum entanglement is a process where the measurable properties of two particles become linked. For example, an entangled pair of photons might share the same polarization, so that when you measure one, youâd also learn the polarization of the other without having to measure it.
Thatâs quantum teleportation in a nutshell, send out an entangled pair of photons and each of the recipients will know what the other got without having to ask. They call it âteleportationâ because the information about who got what doesnât exist until the photons are measured, and canât be intercepted in transit because the act of measuring an entangled particle breaks the entanglement. You physically cannot tap or eavesdrop on a QE link. To do so successfully you would have to be able to capture a photon on the line and transmit an identical copy in its place simultaneously, but the act of measuring takes a non-zero amount of time and even a nanosecond of delay would be obvious to the intended recipient.
Entangled photons are like a pair of identical Shrodingerâs Cats, you canât know if they are alive or dead until you open the box, but you do know that both boxes will show the same result regardless of where they end up.
Whatâs new in this article is that theyâve managed to entangle entire qubits between separate computers, like a single Shrodingerâs Cat that exists in two places at once. Theyâll be able to use this technique to develop the quantum equivalent of parallel processing.
They used a fiber optic cable which transmits information using photons.
Bluetooth ainât faster than the speed of light
It is, in fact, significantly slower, when it works at all.
This is not correct. Bluetooth is a radio frequency communication tool. RF is part of the electromagnetic spectrum and does, in fact, "moveâ at the speed of light.
I think they were making a joke about the bluetooth protocol rather than literally describing the electromagnetic field.
Oh⌠:(
What @knightly@pawb.social said, but I do appreciate the lesson!
Yes, I got really excited, wondering if theyâd solved reassembly.
Clickbait and a borderline-lie.
Quantum teleportation is a very technical thing you can do with qubits; no actual matter is moved. If you canât adequately describe a qubit you shouldnât even care about this.
The actual paper is beyond my level of physics knowledge, but Oxford uni published an article about it themselves which looks far better to me. No clickbait headline and it explains the significance of the achievement far better
https://www.ox.ac.uk/news/2025-02-06-first-distributed-quantum-algorithm-brings-quantum-supercomputers-closer
First distributed quantum algorithm brings quantum supercomputers closer
Great article, thank you for sharing
So not FTL right?
Correct. The speed of light is the speed limit of information in the universe.
Entanglement is neat because it allows us to transmit a quantum superposition to two places at once.
Itâs like an identical pair of Shrodingerâs Cats. You canât know if the cat is alive or dead until you open the box, but you do know that the other box will show the same result as yours regardless of where it ends up.
The new thing theyâve figured out in this article is how to entangle qubits between separate quantum computers, essentially creating a single Shrodingersâ Cat that exists in two computers simultaneously which allows them to do the quantum equivalent of parallel processing.
Articles/titles need to stop using the word âteleportationâ -_- it has very different implications
âquantum teleportationâ is the correct technical term. The problem is articles being written by people who donât realize this is a technical term that needs explanation.
It is, but should not be in the title regardless. Just say entanglement.
I donât disagree, but I think the bigger problem is journalists who misunderstand the topic and erroneously imply that âquantumâ can enable faster-than-light or undetectable communication.
I assume not, but primarily because I would expect the actual scientists and/or Oxford to make a bigger deal out of that if they had achieved it
Look, as someone thatâs not afraid to be wrong Iâm gonna say that Iâm skeptical and say that I donât trust this is real until Iâve read the research papers.
Reading the news nowadays kinda feels like âtrust me broâ unless there are several additional systems based on logic that corroborates what is said as truth.
Edit:
Iâll need more sleep before attempting to read let alone understand the published paper. No promises in how long itâll take for me to provide my thoughts on it.
Couldnât agree more. At first when I read it, I was like âwowâ, the my logical brain did a re-read and I was like âdoubtâ.
This isnât a first, quantum teleportation has been a thing since 1997. The breakthrough here is teleporting the information of an entire logical gate. The usecase here enables them to link multiple smaller quantum processors together so they can act as one bigger system.
Itâs real, but the jargon is unintuitive.
âTeleportationâ in the field of quantum mechanics refers to the process by which a quantum state can be copied from one place to another.
This process is like Shrodingerâs Cat, both alive and dead until you open the box to check. Quantum information simply does not exist until a measurement collapses it into back into classical information, so copying a quantum state literally involves teleporting the information about it from sender to receiver without allowing the box to be opened during the transition.
Can someone explain the significance of quantum teleportation in qbit architectures?
From what little I understand, it relies on quantum entanglement instead of electrical current to âpassâ logic states between qbits in different physical space, but Iâm wondering why (in this case) they still need to be connected by fiber optic cables?
I thought the point was that it didnât need to pass signals over physical media, and that was valuable because it was instantaneous and secure, but now itâs sounding more like conventional computingâŚ?
From what I understand, the significance is that you can transfer the states around while keeping them in a superposition. Thus you can continue to perform computations with them even after moving them to a physically separate quantum computer.
ah, ok that is interesting, thanks!
One step closer to beating the homophobia that is distance :3
Nah, this technique is more like having a Shrodingerâs Cat thatâs in two places at once. It wonât collapse the tyrrany of space, but it will allow us to build bigger and better quantum computers.
Oki :3
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Think of it like an identical pair of Shrodingerâs Cats. You canât know if the cat is alive or dead 'til you open the box, but because theyâre identical you know that the other box will show the same result as your own.
The lasers donât transmit information, they transmit a quantum superposition. The act of measuring this quantum state creates information, and because the photons are entangled, this information includes what was received at both ends.
So the photons that carry the information arenât teleported, but the information itself is because it doesnât exist until it is observed.
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It might be counterintuitive, but thatâs genuinely how quantum systems work.
The entangled photons are in a state of quantum superposition until they are measured, and that measurement creates information about the state of both photons.
Itâs not a process that can be used to transmit classical information, itâs a process that transmits identical quantum random numbers to two places at once that canât be intercepted without breaking their identicalness.
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To simplify, theyâre not just entangling pairs of photons and sending them out to two systems, but entangling entire qubits that exist on separate systems. This allows the qubits on separate systems to interact with each other without collapsing their superposition, enabling the quantum equivalent of parallel processing.
Rather than two identical Shrodingerâs Cats as in entangled photons, the entangled qubits act as one Shrodingerâs Cat thatâs in two places simultaneously.
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The optics are just the medium through which the qubits are entangled, the interesting part isnât the lasers but the interaction between physically-separated qubits.
You could theoretically accomplish the same thing by physically bonking the qubits together so that they interact via nuclear forces instead of the electromagnetic field, like they did with entire molecules at Durham University a few weeks back: https://www.msn.com/en-us/news/technology/world-first-quantum-entanglement-of-molecules-at-92-fidelity-uk-achieves-magic/ar-AA1xfHI9
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It is teleportation, but the thing being teleported is information about a quantum state.
The particles that carry this information are in a quantum superposition, like Shrodingerâs Cat. Because of quantum physics, the information they carry doesnât exist until you open the box and measure it.
They call it âteleportationâ because it allows us to copy quantum information from one place to another without ever opening the box and collapsing the superposition at any point inbetween.
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As confusing as it seems, theyâre correct. A physical medium is still necessary to enable the two parties to interact with each other, but the information that travels through it doesnât exist until it is received.
The photons that carry the information are Shrodingerâs Cat, both alive and dead until the box is opened. Itâs impossible to know one way or another without checking, so the information about the contents of the box doesnât physically exist until then.
This has been proven via the double-slit experiment. Shining a beam of light at a card with two slits in it causes the resulting shadow to show a diffraction pattern. This is caused by the photons interacting with themselves as they pass through both slits simultaneously. However, if you put a photon detector in front of one slit to try and measure which slit the photon passes through, the diffraction pattern dissapears because the act of measuring it collapses the quantum uncertainty and prevents the photon from passing through both slits and interacting with itself. The information about which slit the photon actually passed through simply does not exist, and canât be measured without destroying the quantum diffraction pattern.
Whereâs it say they used a laser to transfer the information? This sounded like quantum entanglement was being demonstrated here
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The word laser does not appear once in this article.
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SoâŚnot in the article, but in a completely different linked article. Got it
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Hyperlink which went to a different article. Do you not understand how the Internet works? Donât act like you werenât wrong when you failed to clarify properly. Thatâs not on me
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