https://news.ycombinator.com/item?id=36310594#36356444 https://news.ycombinator.com/item?id=36310594#36356444 : > What is the maximum presumed distance over wh

https://news.ycombinator.com/item?id=36310594#36356444 https://news.ycombinator.com/item?id=36310594#36356444 : > What is the maximum presumed distance over which photon emissions from blue [sapphire,] LEDs can be entangled? What about with [time-synchronized] applied magnetic fields? Could newer waveguide approaches - for example, dual beams - improve the distance and efficiency of transceivers operating with such a quantum communication channel? > [...] >> Physicists at the University of Konstanz have generated one of the shortest signals ever produced by humans: Using paired laser pulses, they succeeded in compressing a series of electron pulses to a numerically analyzed duration of only 0.000000000000000005 seconds [...] >> For Peter Baum, physics professor and head of the Light and Matter Group at the University of Konstanz, these results are still clearly basic research, but he emphasizes the great potential for future research: "If a material is hit by two of our short pulses at a variable time interval, the first pulse can trigger a change and the second pulse can be used for observation—similar to the flash of a camera" - "Fiber-optic data transfer speeds hit a rapid 301 Tbps" (2024-03) https://news.ycombinator.com/item?id=39864107 https://news.ycombinator.com/item?id=39864107