1. I don’t understand the entangled part, I never heard of entangling a photon with ordinary matter. Does that mean the matter goes at c, or does the photon slow, or neither?

  2. I don’t think entangled particles affect the properties of each other in that way. If you had two coins, one heads and one tails, checking one coin would allow you too instantly know the state of the other coin. If ones heads, the other has to be tails. I’m not entirely sure but I think you can entangle particles with probability or something, such that if the coin is heads there’s an 80% chance it’s tails. Photons and electrons (is what I’m assuming the particles are) both have different states they can be in. This means you can entangle them and send the photon off too a new location.

  3. Speed is not one of the quantum numbers for particles because speed is not quantized, i.e., comes in whole number chunks. So being entangled is not dependent on speed, or even distance. That's why it's so surprising you can determine the quantum state of one number just by knowing the other, even at distances where the information travels FASTER than the speed of light.

  4. The way you typically entangle matter with a photon is actually not too hard to understand. Generally it works by exciting an electronic state (in this case in the calcium ion) such that it has two possible decay pathways. At the end of one of these pathways the electron is in say a spin 'up" state and the other spin "down". The trick is that the decay pathways emit photons with different polarisation so when the ion decays to the up state the photon is vertically polarised, and when it decays to the down state the photon is horizontally polarised for example. This gives you a state of the form |up>|V> +|down>|H> which is a maximally entangled state of the ion with the polarisation of the photon. This type of experiment had been done with loads of matter based systems including defects in diamond, semiconductor quantum dots and other trapped ion spieces. This paper is a technical improvement with a longer distance over which the ion and photon are entangled.

  5. To generate encryption keys at the source and destination simultaneously. The encrypted data is still sent over a classical channel. The key is never transferred so it can't be intercepted, and you can generate a bit of key for every bit of data so it can be perfectly encrypted, indistinguishable from noise.

  6. Really secure and really fast networking. Today's communication uses an electric current to carry information around the different components in a computer. This current is made up of a continuous flow of millions or billions of electrons. But imagine if we could just use 1 or 2 of those particles without any waste. That's what quantum computing is. Its reducing the complexity of a signal down to the smallest it theoretically can be by using individual particles as those ones and zeros. And by making use of entanglement you can ensure really secure communication by making it impossible to read without changing the message. And particles can also be in a quantum state called superposition, meaning that instead of being definitively 1 or 0 it can be both 1 or 0, allowing these tiny systems to perform implicit calculations that simultaneously produce every possible answer to a solution rather than going through them sequentially like classical computers. Not only will this revolutionize communication bandwidths, but it'll also make processing many simple calculations in bulk much easier and make large scale simulations just as must easier to simulate.

  7. For sure that same question asked of many revolutionary developments at the time. I’m thinking people thought that exact thing when the car was developed.

  8. Instant communication across unlimited distances. I predicted this when I first heard quantum entanglement was a thing, and it's also why I think looking for radio signals from advanced alien civilizations is mostly a waste of time as I am of the opinion that any advanced alien civilization would be using something like quantum entanglement for communications.

  9. "measurements show that atom and light particle are still entangled even after the wavelength conversion"

  10. How are we so sure this kind of technology will be easily accessible to consumers? I don’t think we will have this available to consumers in our life time

  11. If quantum computers will be able to crack blockchain security, it should be noted that this is still a significant amount of time away. It is widely accepted that quantum hardware will not be good enough to run encryption breaking schemes (such as Shor's algorithm for cracking RSA) for at an absolute minimum 10 years. This number is most likely on the order of 20 years, and this may provide ample time for people to switch encryption schemes or away from blockchain. The point is, it is not good advice to be telling people to sell crypto currencies because of this research.

  12. Enthusiastic scify reader here: Would this mean FTL communication? Could the fiber optic cable be removed and still keep the communications chanel?

  13. No FTL communication with this method. In fact, no known FTL communication with any method. Could the fiber optic cable be removed? Probably, yes. But at the cost of distance in viable detection. Perhaps from 50 kilometers down to a few meters or less. But that's a guess.

  14. You still need to confirm that entangled systems are entangled using systems limited by the speed of light. Essentially you could entangle two distant points, like Earth and Mars, but that would only amount to secure communication. It would still be limited by light speed because you would basically need to communicate the key as well. Otherwise an entangled particle is indistinguishable from any other particle. Basically you can't tell that particles are entangled without observing them acting in an entangled manner.

  15. FTL communication will most likely never be possible, because if it was it would mean the message would arrive before it was sent.

  16. We do know that it doesn't break relativity. You need additional information (bound by light speed) send to you to actually get information out of the entanglement

  17. I love the grammatical ambiguity in the blurb. Is this the first time anyone has done this, or just the first time a team lead by this one guy has?

  18. Why doesn't the traveling through the cable break the entanglement? I thought it had to move through a vacuum or the entanglement would collapse when it hit an atom.

  19. It makes me really proud that our small country is so renowned for our engineers, scientists, doctors,... really cool

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