3 ms·
Can someone please explain how is quantum teleportation different than, transmitting information about object and then making another object behave the same way
by NiceWayToDoIT 6y ago
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?
- jrgd 6y agoit feels like the core advantage over current information transportation is for inter planetary communication.
- NiceWayToDoIT 6y agoI 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?
- jrgd 6y agocouldn’t find a reference to laser in the article; where did you read this?
- joshuaissac 6y agoLasers are mentioned in the linked arXiv paper: https://arxiv.org/abs/1707.00934 https://arxiv.org/abs/1707.00934
- NiceWayToDoIT 6y agoI would like to know what kind of interesting mind downvotes question?!
- monadic3 6y agoThe only benefit that quantum entanglement provides is the agreement of a key over a distance. Communication itself would be "normal", i.e. EM.
- lisper 6y agoThat is exactly what it is. The only reason it's a thing at all is that the state being moved is a quantum state and quantum states can't be copied.
- monadic3 6y agoA 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.
- IgorPartola 6y agoIt’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.
- jrootabega 6y agoYou 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
- IgorPartola 6y agoAh so the first use case is out then. Thanks for the correction.
- deleted 6y ago[deleted]
- monadic3 6y agoIt does not help with time sync at all; you can't detect a collapse, just trigger it.