I read this article about how physicists now have an experiment that can find entangled particles that much easier.
To study entangled particles,
physicists have to be able to detect them. In some experiments,
researchers measure one of the entangled pair first, and its presence
signals, or "heralds," the presence of the second particle. Recently, a
team of physicists at the Joint Quantum Institute
in College Park, Md., achieved a new record in heralding efficiency,
meaning they were able to detect more twin particle pairs than ever
before.
In the experiment, the researchers used what's called a pump laser to
produce a beam of light that passes through a special type of crystal.
Occasionally, the photons of light in the laser beam will split in two,
essentially, after passing through the crystal, creating a new pair of
correlated photons. These photons will hit a detector screen exactly 180
degrees apart, so if the researchers find one, they know to look
directly across the circle pattern formed on the detector, to the point
180 degrees around, to find the other.
Okay now a long distance communication device can be created via Sci-Fi magic. You put a bunch of tangled particles in a special device and put their pairs in a similar device. Then you agitate one group of particles and the other group will mimic the same behavior.
So then you can do something similar to Morse Code via electricity in the 1800s. Or it can be used to transmit binary code depending on how many tangled particles are in each of the boxes. So someone at Mission Control on earth hits a button that puts a pulse or something into the group of particles on Earth and the identical box on a ship heading to Proxima Centauri lights up. This is a so-called "Generation Ship" where whole generations of people live and die on-board a massive ship moving slower than light toward that star.
When the Generation Ship "Proxima One" lands the box can then be used to transmit rudimentary communications with Earth. I can picture a small screen on the box that picks up the movement of the particles in a certain way that flashes "we have arrived at Proxima 3 and are in orbit. There is a settlement on the planet!"
Then the settlement turns out to be humans who came from Earth after they figured out space time folding and are there to greet the brave settlers of the "Proxima One" and declare them as heroes of mankind. These humans were afraid to tell the settlers that their mission was no longer needed after 150 years when space time folding was invented. They kept the weekly Earth communications via the "QT communicator" going so the settlers would not become discouraged.
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