Technically neutrino signalling could make it faster, but those extra milliseconds are not worth it, even for the HFT folks... but thanks to them we have shorter fiber routes across the atlantic at least.
you need a nuclear reactor for transmission and a deep array of detectors buried underground for reception...
Can you explain how HFT caused a shorter fiber route across the Atlantic? Is this route open to the non-HFT public?
I read Flash Boys and am aware of a custom fiber link between Weehauken, NJ and Chicago, IL, but I thought they are were moving to microwave. I thought there were some HFT links (fiber or microwave) within Europe.
https://sniperinmahwah.wordpress.com/2016/01/26/hft-in-the-b...
There are apparently shortwave links across the Atlantic:
https://sniperinmahwah.wordpress.com/2018/05/07/shortwave-tr...
https://sniperinmahwah.wordpress.com/2018/07/16/shortwave-tr...
These should have a lower latency than fibre links although the shortwave link will probably have rather a low data rate.