It looks like you're using an Ad Blocker.
Please white-list or disable AboveTopSecret.com in your ad-blocking tool.
Thank you.
Some features of ATS will be disabled while you continue to use an ad-blocker.
Originally posted by Cauliflower
15 years ago the Los Alamos web site had information about a quantum cryptography system for re-keying satellites. Worked equally well with polarized shuttered uplinks and fiber optics. Now they have it working through data hubs, no surprise. Should have been a cold war development for the CORONA era sats.
Historically we have relied on weak public key cryptography to authenticate E-commerce and that has its limits. This is good news! Much more robust multi channel encryption schemes that absolutely eliminate eavesdropping MITM attacks are possible.
QinetiQ was only one target in a broader cyberpillage. Beginning at least as early as 2007, Chinese computer spies raided the databanks of almost every major U.S. defense contractor and made off with some of the country’s most closely guarded technological secrets, according to two former Pentagon officials who asked not to be named because damage assessments of the incidents remain classified.
Originally posted by Bedlam
Legend has it that the later DSP satellites have quantum crypto sidelinks that can detect interception.
No idea if it's true.
If developed, quantum teleportation satellites could allow spies to pass large amounts of information back and forth or create unhackable codes. Should we ever build quantum computers – which would be smaller and exponentially more powerful than modern computers, able to model complex phenomenon, rapidly crunch numbers, and render modern encryption keys useless – they would need quantum teleporters in order to be networked together in a quantum version of the internet.
China plans to launch a satellite with a quantum teleportation experiment payload in 2016 and the European, Japanese, and Canadian space agencies are hoping to fund their own quantum teleportation satellite projects in the coming years. Conspicuously, the U.S. is far behind the pack because of a bureaucratic reshuffling that left quantum communication research experiments without government support in 2008. Whoever loses this new competition could fail to capitalize on the promise of quantum communication altogether.
entangled pairs work like this. Particle A is here on earth, you give it a clockwise rotation. Particle B is hundreds of miles away, and the instant you start nudging Particle A, particle B responds, as if they are linked through time and space. That's how quantum communication would work. Zero latency communication, regardless of distance, regardless of the speed of light.
Originally posted by SloAnPainful
reply to post by DaveStinger
Yes I know, but I am sure it's fast as hell. I was making a joke that apperently wasn't funny.
-SAP-
Originally posted by DaveStinger
Originally posted by darkbake
reply to post by DaveStinger
That is true - but would it be instant between the two quantum particles themselves? So it would still save time over a few light year distance, for example, compared to light-based communication?
There is no FTL travel of information between the entangled particles possible at all, because there is no way for info to travel between them.
It only appears to be to us......edit on 6-5-2013 by DaveStinger because: (no reason given)
You might want to figure out what DaveStinger and mbkennel are saying because I think it's more correct than what phishyblankwaters said, talking about how FTL communication would work. We don't know how it would work because we've never seen FTL communication. Instantaneous action at a distance is not really communication.
Originally posted by darkbake
reply to post by phishyblankwaters
Thank you! I didn't understand what DaveStinger was saying.
Originally posted by mbkennel
Originally posted by DaveStinger
Originally posted by darkbake
reply to post by DaveStinger
That is true - but would it be instant between the two quantum particles themselves? So it would still save time over a few light year distance, for example, compared to light-based communication?
There is no FTL travel of information between the entangled particles possible at all, because there is no way for info to travel between them.
It only appears to be to us......edit on 6-5-2013 by DaveStinger because: (no reason given)
Correct.
There appears to be a FTL travel of "something" between the entangled particles (all attempts to find causal local explanations have been invalidated by experiment) but there is no known way to transmit useful classical Shannon information FTL. Correct explanation of the equations of motion as we know them requires FTL behavior, but no FTL information.
It seems as though conditional correlations can somehow be arranged to coincide, e.g. P1(x|y) can be made to be correlated with P2(x|y) at remote locations 1 and 2 faster than light, but the outcome cannot be transmitted FTL.edit on 7-5-2013 by mbkennel because: (no reason given)
Originally posted by darkbake
reply to post by phishyblankwaters
Thank you! I didn't understand what DaveStinger was saying.edit on 7-5-2013 by darkbake because: (no reason given)
Originally posted by DaveStinger
reply to post by darkbake
So in quantum physics, two particles can be entangled and that means that when one of them is moved, the other one moves - it happens faster than the speed of light, and can be used to communicate instantly at a distance.
This is a common mistake.
It can't used for instant communication because there always has to be a secondairy means of communication between the two points about the manipulation, and this can only be done with a less than FTL speed.
Easy peasy.