3 ms·

So what can this really be useful for?

by djxfade 6y ago

magicalhippo 6y ago
I'm no expert, but AFAIK one thing is secure communication, in the sense that the recipient can detect if anyone is eavesdropping. As I've understood it, to "listen in" the eavesdropper has to destroy the entangled state by measuring it, and there's no way to perfectly clone the entangled state before doing that. The recipient can compare the entangled data with the measurement results (sent via classical means) and detect statistical inconsistencies if there is an eavesdropper. edit: I see their page[1] mentions quantum metrology, which I found reference to in a page[2] describing work to improve GPS and similar detection using quantum entanglement. Not sure if it's directly related but seems like there should be room for some interesting work using this quantum network in this area. [1]: https://ieqnet.fnal.gov/ https://ieqnet.fnal.gov/ [2]: https://news.engineering.arizona.edu/news/quantum-entanglement-offers-unprecedented-precision-gps-imaging-and-beyond https://news.engineering.arizona.edu/news/quantum-entangleme...
dodobirdlord 6y ago
Another response already mentioned one aspect of how this can be used for secure communication, for detecting signal interception. But there’s a second aspect as well. Since the signaling is broken up into two parts (send the entangled state, send the measurement result), both parts have to be intercepted to decode the communication. The entangled state can be sent over a secure channel in advance, and the measurement sent over an insecure channel at the time of information transmission. This is analogous to sharing a one-time pad in advance, but the key distinction is that the no-cloning theorem guarantees that it’s impossible for someone to have stolen a copy of your one-time pad. They can only have stolen your one time pad, in which case you would notice.

3 ms·

So what can this really be useful for?

by djxfade 6y ago

So what can this really be useful for?

magicalhippo 6y ago
I'm no expert, but AFAIK one thing is secure communication, in the sense that the recipient can detect if anyone is eavesdropping. As I've understood it, to "listen in" the eavesdropper has to destroy the entangled state by measuring it, and there's no way to perfectly clone the entangled state before doing that. The recipient can compare the entangled data with the measurement results (sent via classical means) and detect statistical inconsistencies if there is an eavesdropper. edit: I see their page[1] mentions quantum metrology, which I found reference to in a page[2] describing work to improve GPS and similar detection using quantum entanglement. Not sure if it's directly related but seems like there should be room for some interesting work using this quantum network in this area. [1]: https://ieqnet.fnal.gov/ https://ieqnet.fnal.gov/ [2]: https://news.engineering.arizona.edu/news/quantum-entanglement-offers-unprecedented-precision-gps-imaging-and-beyond https://news.engineering.arizona.edu/news/quantum-entangleme...
dodobirdlord 6y ago
Another response already mentioned one aspect of how this can be used for secure communication, for detecting signal interception. But there’s a second aspect as well. Since the signaling is broken up into two parts (send the entangled state, send the measurement result), both parts have to be intercepted to decode the communication. The entangled state can be sent over a secure channel in advance, and the measurement sent over an insecure channel at the time of information transmission. This is analogous to sharing a one-time pad in advance, but the key distinction is that the no-cloning theorem guarantees that it’s impossible for someone to have stolen a copy of your one-time pad. They can only have stolen your one time pad, in which case you would notice.