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For the first time in the history of quantum mechanics, scientists have been able to transmit a black and white image without having to send any physical particles. The phenomenon can be explained using the Zeno effect, the same effect that explains that movement itself is impossible.
The journal article is in Proceedings of the National Academy of Sciences of the United States of America (DOI: 10.1073/pnas.1614560114)
Wikipedia has an article about the quantum Zeno effect.
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Physicists Break Distance Record for Quantum Teleportation
First Covert Communication System with Lasers
Long-Range Secure Quantum Communication System Developed
China's "Quantum-Enabled Satellite" Launches
How to Outwit Noise in Quantum Communication
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Direct Counterfactual Quantum Communication Claimed
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Ten years of rejection slips is nature's way of telling you to stop writing.
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(Score: 2) by JoeMerchant on Sunday May 21 2017, @12:08PM (1 child)
The "simple relative motion" example always tossed around on pop-sci shows is: A is A "stationary". B accelerates away from A to relativistic speed, now B runs slow. B keeps on going in a loop at relativistic speeds (lots of acceleration there), then returns to A - the "interstellar traveler" from "B ship" has aged 1 year, but his family and friends on A have all been dead for a thousand. What I've never seen the pop-sci shows get into is "C ship" that tears off in the opposite direction of B, now C is moving even closer to the speed of light, relative to B, but if they both arrive back at A simultaneously, A is aged the same for both of them, but why are they the same age as each other?
I still love the concept that the photons leaving the surface of stars 10 billion years ago are arriving in our telescopes "instantly," unaged since they were emitted.
🌻🌻 [google.com]
(Score: 2) by wonkey_monkey on Sunday May 21 2017, @06:11PM
B and the C are the same age because they've undergone identical accelerations. The one who ages the most is the one who took the straightest path from launch to meet-up - in this case A, because he didn't accelerate at all, he just let "meet-up" come to him. The other two took wiggly paths, but identically wiggly, so the amount of time experienced by themselves on their trip is the same.
During the constant relative motion parts (among all three of them), they all see the others' clocks runs slow. But during accelerations towards each other, there are times when others' clocks run fast.
Kind of... but the standard physicist answer to this is that photons don't have reference frames, so you can't consider anything from their "point of view" - they don't have one. The math does pretty clearly point in that direction, though.
systemd is Roko's Basilisk