* Posts by Geralds-for-himself

3 posts • joined 8 Oct 2018

Japan starts work on global quantum crypto network


Trusted and entrusted nodes for QKD

There was an research paper in Nature using a satellite as an untrusted node in quantum key distribution. This has been demonstrated. While it's only 2 trusted nodes in the paper it's easy to see how it can be expanded.

Yin, J., Li, Y., Liao, S. et al. Entanglement-based secure quantum cryptography over 1,120 kilometres. Nature 582, 501–505 (2020).


A few reasons why cops haven't immediately shot down London Gatwick airport drone menace


What about zapping it with high powered radar?

How about a short burst of a high powered radar to fry its electronics? just a short burst, when no aircraft are in the line of sight for the radar beam. Then use the serial number to track down the one who broke the law.

It's over 9,000! Boffin-baffling microquasar has power that makes the LHC look like a kid's toy


Pulsed vrs continuous

So the LHC can push protons to 14 Tev, the total energy in a beam is significant.

Using data from CERN:

2808 bunches of protons * 1.2 x 10^11 protons * 6.5 Tev / proton ~= 3.78 10^9 joules

I know we say 14 Tev, that would up the energy to ~7.5 10^9 joules

Pardon my crude calculations....

I bet the quasar is outputting more than that per day...

I would say the total energy, were it directed directly at Earth might cause some problems


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