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Originally Posted by Mora321
"In 2017 the team, along with a group of researchers in Austria, was able to employ the satellite to perform the world’s first quantum-encrypted virtual teleconference between Beijing and Vienna."
scientificamerican.com
"Here we demonstrate entanglement-based QKD between two ground stations separated by 1,120 kilometres at a finite secret-key rate of 0.12 bits per second, without the need for trusted relays.
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Tell me how on Earth are they able to determine that they were able to shoot such a specific amount of photons when a photon is 10,000 times smaller than an atom and an atom is still too small for us to actually observe directly let alone something 10,000 times smaller so then how do we have a machine capable of determining individual photons how did we calibrate such a machine how did we confirm its accuracy and how do we know it's doing what they say it's doing when we can't even observe something 10,000 times larger?