The electron pipe is a slightly mis-named high speed comms solution that would make optical fibre look like two bean cans and a bit of loose string. I invented it in 1990, but it still remains in the future since we can’t do it yet, and it might not even be possible, some of the physics is in doubt. The idea is to use an evacuated tube and send a precision controlled beam of high energy particles down it instead of crude floods of electrons down a wire or photons in fibres. Here’s a pathetic illustration:
Initially I though of using 1MeV electrons, then considered that larger particles such as neutrons or protons or even ionised atoms might be better, though neutrons would certainly be harder to control. The wavelength of 1MeV electrons would be pretty small, allowing very high frequency signals and data rates, many times what is possible with visible photons down fibres. Whether this could be made to work over long distances is questionable, but over short distances it should be feasible and might be useful for high speed chip interconnects.
The energy of the beam could be made a lot higher, increasing bandwidth, but 1MeV seamed a reasonable start point, offering a million times more bandwidth than fibre.
Predictions for memory, longer term storage, cloud service demands and computing speeds are already heading towards fibre limits when millions of users are sharing single fibres. Although the limits won’t be reached soon, it is useful to have a technology in the R&D pipeline that can extend the life of the internet after fibre fills up, to avoid costs rising. If communication is not to become a major bottleneck (even assuming we can achieve these rates by then), new means of transmission need to be found.
A way must be found to utilise higher frequency entities than light. The obvious candidates are either gamma rays or ‘elementary’ particles such as electrons, protons and their relatives. Planck’s Law shows that frequency is related to energy. A 1.3µm photon has a frequency of 2.3 x 1014. By contrast 1MeV gives a frequency of 2.4 x 10^20 and a factor of a million increase in bandwidth, assuming it can be used (much higher energies should be feasible if higher bandwidth is needed, 10Gev energies would give 10^24). An ‘electron pipe’ containing a beam of high energy electrons may therefore offer a longer term solution to the bandwidth bottleneck. Electrons are easily accelerated and contained and also reasonably well understood. The electron beam could be prevented form colliding with the pipe walls by strong magnetic fields which may become practical in the field through progress in superconductivity. Such a system may well be feasible. Certainly prospects of data rates of these orders are appealing.
Lots of R&D would be needed to develop such communication systems. At first glance, they would seem to be more suited to high speed core network links, where the presumably high costs could be justified. Obvious problems exist which need to be studied, such as mechanisms for ultra high speed modulation and detection of the signals. If the problems can be solved, the rewards are high. The optical ether idea suffers from bandwidth constraint problems. Adding factors of 10^6 – 10^10 on top of this may make a difference!