🖖🏾
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.
That’s 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 can’t 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 what’s being teleported. The photons that carry the information still have to travel from sender to recipient but the information they contain doesn’t exist until it is received. Like how Shrodinger’s 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 “teleportation” and “entanglement”. Please do ask if you’ve got any other questions! 😄
Yes, I got really excited, wondering if they’d 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 can’t adequately describe a qubit you shouldn’t 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
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.
It’s like an identical pair of Shrodinger’s Cats. You can’t 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 they’ve figured out in this article is how to entangle qubits between separate quantum computers, essentially creating a single Shrodingers’ 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 ‘teleportation’ -_- it has very different implications
I don’t disagree, but I think the bigger problem is journalists who misunderstand the topic and erroneously imply that “quantum” can enable faster-than-light or undetectable communication.
“quantum teleportation” is the correct technical term. The problem is articles being written by people who don’t realize this is a technical term that needs explanation.
It is, but should not be in the title regardless. Just say entanglement.
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 that’s not afraid to be wrong I’m gonna say that I’m skeptical and say that I don’t trust this is real until I’ve read the research papers.
Reading the news nowadays kinda feels like “trust me bro” unless there are several additional systems based on logic that corroborates what is said as truth.
Edit:
I’ll need more sleep before attempting to read let alone understand the published paper. No promises in how long it’ll take for me to provide my thoughts on it.Couldn’t agree more. At first when I read it, I was like “wow”, the my logical brain did a re-read and I was like “doubt”.
This isn’t 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.
It’s real, but the jargon is unintuitive.
“Teleportation” 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 Shrodinger’s 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.
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Think of it like an identical pair of Shrodinger’s Cats. You can’t know if the cat is alive or dead 'til you open the box, but because they’re identical you know that the other box will show the same result as your own.
The lasers don’t 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 aren’t teleported, but the information itself is because it doesn’t exist until it is observed.
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It might be counterintuitive, but that’s 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.
It’s not a process that can be used to transmit classical information, it’s a process that transmits identical quantum random numbers to two places at once that can’t be intercepted without breaking their identicalness.
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“Previous demonstrations of quantum teleportation have focused on transferring quantum states between physically separated systems,” said Dougal Main, from the Department of Physics at the University of Oxford, who led the study.
"In our study, we use quantum teleportation to create interactions between these distant systems. By carefully tailoring these interactions, we can perform logical quantum gates – the fundamental operations of quantum computing – between qubits housed in separate quantum computers.
“This breakthrough enables us to effectively ‘wire together’ distinct quantum processors into a single, fully-connected quantum computer.”
To simplify, they’re 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 Shrodinger’s Cats as in entangled photons, the entangled qubits act as one Shrodinger’s Cat that’s in two places simultaneously.
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The optics are just the medium through which the qubits are entangled, the interesting part isn’t 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
Where’s 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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So…not 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? Don’t act like you weren’t wrong when you failed to clarify properly. That’s not on me
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 ‘pass’ logic states between qbits in different physical space, but I’m wondering why (in this case) they still need to be connected by fiber optic cables?
I thought the point was that it didn’t need to pass signals over physical media, and that was valuable because it was instantaneous and secure, but now it’s sounding more like conventional computing…?
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 Shrodinger’s Cat that’s in two places at once. It won’t collapse the tyrrany of space, but it will allow us to build bigger and better quantum computers.
Oki :3
