3 ms·

Except in the case of the top article,as far as I understand, information could in theory be transmitted thanks to time. A spin change can represent a 1 bit, an

by bpicolo 14y ago

Except in the case of the top article,as far as I understand, information could in theory be transmitted thanks to time. A spin change can represent a 1 bit, and the lack of a spin change at a time can represent a 0 bit.

tedsanders 14y ago
No, entanglement cannot transmit information. It does not (necessarily) violate speed-of-light causality. Like eoinmurray92 said, entanglement can be useful for cryptography. It can also be useful for quantum computing, where you need to find clever algorithms where the wrong answers "cancel out."
eoinmurray92 14y ago
It can be used to share a cipher (one-time-pad) because you and I would know the arrangement of bits that the other person has, and no-one else would/could know. However the measurements on the qubit's are probabilistic, so we cannot control the arrangement of bit that we have. We will only know if the are correlated/anti-correlated.
- XorNot 14y ago
  I still live in hope we'll find a way to use it for communication. A system where you had to use a slower-then-light synchronization signal to maintain the entangled state, but didn't actually transmit information over non-entangled bands, would fundamentally revolutionize communication none-the-less. Being able to send data across the Pacific at essentially the speed of light, which was uninterceptable, would still be a massive breakthrough. Work on "weak" measurements of superpostioned systems interests me to that end (http://en.wikipedia.org/wiki/Weak_measurement http://en.wikipedia.org/wiki/Weak_measurement)
  - eoinmurray92 14y ago
    I am quite confident that quantum dots will be able to do this sort of thing soon (10yrs). They are shown to be reliable and resistant to decoherence. I don't know much about that weak measurement stuff, only in really theoretical situations thus far. But it seems a nice way to probe entanglement. Toshiba @ Cambridge have recently shown QKD over broadband networks over 90km using single photon sources. Before that the distance record was held by Tyndall in Ireland.

by bpicolo 14y ago

tedsanders 14y ago

No, entanglement cannot transmit information. It does not (necessarily) violate speed-of-light causality. Like eoinmurray92 said, entanglement can be useful for cryptography. It can also be useful for quantum computing, where you need to find clever algorithms where the wrong answers "cancel out."

eoinmurray92 14y ago

It can be used to share a cipher (one-time-pad) because you and I would know the arrangement of bits that the other person has, and no-one else would/could know. However the measurements on the qubit's are probabilistic, so we cannot control the arrangement of bit that we have. We will only know if the are correlated/anti-correlated.

XorNot 14y ago
I still live in hope we'll find a way to use it for communication. A system where you had to use a slower-then-light synchronization signal to maintain the entangled state, but didn't actually transmit information over non-entangled bands, would fundamentally revolutionize communication none-the-less. Being able to send data across the Pacific at essentially the speed of light, which was uninterceptable, would still be a massive breakthrough. Work on "weak" measurements of superpostioned systems interests me to that end (http://en.wikipedia.org/wiki/Weak_measurement http://en.wikipedia.org/wiki/Weak_measurement)
- eoinmurray92 14y ago
  I am quite confident that quantum dots will be able to do this sort of thing soon (10yrs). They are shown to be reliable and resistant to decoherence. I don't know much about that weak measurement stuff, only in really theoretical situations thus far. But it seems a nice way to probe entanglement. Toshiba @ Cambridge have recently shown QKD over broadband networks over 90km using single photon sources. Before that the distance record was held by Tyndall in Ireland.