Mini-satellite paves the way for quantum messaging anywhere on Earth
nature.com
nature.com
Does hollow-core fibre suffer the same limitation?
I wonder what specific uses they mean. It's kind of hard to believe those are "serious" use-cases, going beyond demonstrations done for marketing reasons... Then again, as soon as you have a serious use-case, you don't tell anyone about it, so it's really hard to evaluate how much (if at all) this stuff is really used in practice.
Do you know any instances of practical usage? People getting actual keys and using those to encrypt actual sensitive data?
> what is a dumb thing?
Emphasizing quantum key control. In the situations where it's really relevant you don't need buy-in from investors, the value is evident.
Sayonara!
Other than money, what are the non-negotiable requirements for such a system to be deployed and to work as expected? What is the exact breakthrough here?
However its pretty useless. QKD, does basically the same thing as the diffie-helman protocol, except with less math assumptions. Like diffie-helman it protects against passive evesdroppers but not active man in the middle. Any real system is going to have to use traditional crypto for active MITM protection, and if you are already using traditional crypto, might as well use it for the whole thing.
In essence this is a cool science experiment but doesn't really offer meaningful improvements over traditional crypto methods.
You cannot use this mechanism to send messages, only to agree on a secret that neither party chooses.
QKD also isn't safe against (active) MITM attacks, which is kind of important.
the micro-debris will make orbits impossible for the next century
and that's assuming they don't use EMP from orbit to take out ground communications too like starfish prime
It would be a slow-moving but certain mass-extinction event
A single modern nuke is 30-80 times more powerful than Hiroshima
And then look at the socio-economic devastation of something like Covid
In a nuclear attack, it's unlikely "we'll" be fine, but someone will be.
There never ever has been an above-ground test of a modern enhanced hydrogen bomb in the USA
The Bikini Atoll test in the 1950s using 75 year old technology killed people via radiation over 130 miles away
Modern ICBMs carry several much more powerful warheads than that
Even a few of them would make life on earth a permanent hell like peak covid pandemic but forever
Even the "smallest" nuclear war would be one-and-we're-done event
Eventually some tyrant on their deathbed will do it though
Holy shit.
I'm not sure what's "a small number of nukes" in your book. Last I read about it, estimates suggest e.g. India and Pakistan dropping their entire arsenals on each other would indeed cause a nuclear winter.
Low LEO will mostly clear out in a few years. And for really important satellites that matter a lot no matter what the cost, they can still be used. You just have to accept a higher rate of attrition.