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If we extend the definition of "computing" slightly to include "coding and cryptography", then I find superdense coding quite exciting [0]. In a hypothetical qu
by n4r9 2y ago
If we extend the definition of "computing" slightly to include "coding and cryptography", then I find superdense coding quite exciting [0]. In a hypothetical quantum internet we could encode and transmit two classical bits in every qubit, which effectively doubles your bandwidth. There's also quantum key distribution [1]. In principle, quantum theory allows Alice and Bob to establish a shared private key which cannot be broken without breaking the laws of physics. You can chat privately with people secure in the knowledge that not even the NSA can possibly be listening.
[0] https://en.wikipedia.org/wiki/Superdense_coding https://en.wikipedia.org/wiki/Superdense_coding
[1] https://en.wikipedia.org/wiki/Quantum_key_distribution https://en.wikipedia.org/wiki/Quantum_key_distribution
- qup 2y ago> You can chat privately with people secure in the knowledge that not even the NSA can possibly be listening. Well, from one possible attack vector, anyway. They can still point lasers at your windows.
- fluoridation 2y ago>In a hypothetical quantum internet we could encode and transmit two classical bits in every qubit, which effectively doubles your bandwidth. Hmm... What exactly are you transmitting in such a scenario? What's the physical layer protocol? I.e. what are the wires made of and what flows through them?
- evandrofisico 2y agoPhotons, most of the current efforts for quantum entanglement pairs transmission is using good old lasers over optical fiber
- fluoridation 2y agoWell, fair enough I suppose. Although a superficial reading would suggest this sort of technology is at least fifty years away from being deployable at opposite ends of a submarine cable to double the capacity without doubling the cable-laying. It reads like it's in the very early experimental stage, where they're barely demonstrating the plausibility, let alone the viability.
- n4r9 2y agoThe question was why is quantum computing exciting, not when can we get it.
- fluoridation 2y agoThe "although" wasn't meant to invalidate it as an example, it was a link between two separate ideas.
- bgnn 2y agoOnly 2x bandwidth improvement?