The article is essentially nonsense. Entanglement cannot transmit arbitrary information. At best, it can provide remote synchronization. E.g. my photon collapsed to a 0, therefore I know my partner's photon is a 1. We will execute Playbook A.
Also, nothing teleported. The photon in question was sent via a laser.
Exactly. ELI5 is that quantum teleportation is (sadly) a marketing phrase. It is 2020 and such phrases as "teleported an object" are simply a mischief.
Because the quantum teleportation protocol requires the transmission of classical information in order to complete it. It's really a bogus label. Nothing physical is being teleported. It's just a way of using two classical bits to move a qbit from A to B.
Information is the result of an interpretation, not the data you try to share with a distant interpreter.
As current widely admitted interpretation of red shift tell us, there are star moving away from us at a pace faster than speed of light, due to time-space inflation.
And finally, one possible interpretation of quantic intrication is that the change reflected on two distant objects is that there are actually the same object on some dimension which we can't grab with our tools.
None of these invalidate the idea of a maximum speed for all objects along a given dimension of a stable space.
One quibble with your phrasing. Spacetime is expanding. Inflation is a word reserved for the idea of a period of hyper-expansion in the very early universe.
The expansion of spacetime is also accelerating. Stars that are very far away from us will be increasing their distance faster than light could travel. They are passing beyond our horizon.
What you call "quantic intrication" is usually referred to as quantum entanglement. Current working theories have it that entangled fields interact over a spacetime bridge (an Einstein-Rosen bridge) also known as a wormhole, between the two allowing locality of information exchange (ER=EPR conjecture).
Can someone please explain how is quantum teleportation different than, transmitting information about object and then making another object behave the same way as the first one?
A better way to look at it is that a key is agreed upon, but not known, when the particles are entangled. When it collapses, you can read the key. The information, the key itself, still travels bounded by light speed from the point of entanglement. You cannot "write" over the entangled particles so this does not provide instantaneous communication.
It’s worse than that. You have a pair of photons. You have no idea what state they are in because they aren’t. You send me one. You cannot influence if I’ll get it in the 1 or the 0 state. All you can do is later measure your photon and see what state it’s in and that will tell you what state my photon is in. It won’t let you transmit information IIUC and it won’t let you travel faster than light. It might help with time sync (when I measure my photon yours collapses instantly so we can synchronize an event), or synchronize some arbitrary key material: you send me a bunch of photons and then measure yours. I now know exactly what bits you have because they are the opposite of mine and we can use that for cryptography. I know that nobody snooped on this because any measurement would have collapsed the photons.
You actually have no idea when and if the other entangled thing was measured. I'm at my limits of understanding, but I believe it makes no difference when you collapse them. You could do it before moving them apart and the whole process is the same. In fact, process is probably an inadequate word. The particles always shared a state. There aren't two particles; there's a system, and that system was created from 2 particles. You don't observe a particle, you observe the system. You know everything about the system from the single observation
I still do not understand, as they do not carry Qubits, but they use laser to transmit information, why not use the laser in the first place to transmit information?
