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Quantum entanglement can't transfer information because you have no way of knowing whether the other end has "observed" their particle(s) yet. A conventional si
by api 7y ago
Quantum entanglement can't transfer information because you have no way of knowing whether the other end has "observed" their particle(s) yet. A conventional signal is required to establish this.
But... as far as I recall there may be ways to have that conventional signal only carry minimal (e.g. parity) information and thus to achieve not only much higher data rates but physically un-snoopable communication. I wonder if you could pair quantum entanglement with a slow ultra-long-range signal in the low frequency range to achieve high speed perfectly secure long distance links? I assume this sort of thing would be first of interest to military and intelligence users.
- akersten 7y agoRegarding the observation problem: Wouldn't you be able to set up a protocol beforehand (e.g. sample the photon at X MHz) and then you know your window for when the other side would have had the chance to observe? Isn't this how a lot of time division multiplexing already works? For me the bigger issue with quantum computing is that I just don't believe it will ever be practical. Feels like we've been seeing this same article for the last 30 years. I'll love to be proven wrong.
- gwbas1c 7y ago> Quantum entanglement can't transfer information because you have no way of knowing whether the other end has "observed" their particle(s) yet Maybe I'm misunderstanding this, but this just reminds me of old serial communication without hardware flow control. As long as both sides can send messages to each other, there's special control codes that are included in the stream for flow control.
- knodi 7y agoThere are many ways to get around this, like side channels.
- deleted 7y ago[deleted]
- vitus 7y agoYou don't need teleportation for secure comms; you just need pairs of entangled qubits (at which point you can just use their measurements as a one-time pad). That said, if you really want to amplify your transmission rate, you'll also need massive ensembles of entangled qubits (i.e. instead of pairs, you'd need N-tuples). Entanglement gets much, much harder to sustain as the ensemble size goes up. Oh, and you'll also want to replenish your entangled ensembles on a regular basis, since they decohere over time, and you can't reuse them across messages (since measurement destroys entanglement)...