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Freezing positronium with lasers is the new way to understand antimatter.



"Positronium cooling. The AEgIS collaboration at CERN has experimentally demonstrated the laser cooling of positronium using an alexandrite-based laser system. Credit: CERN – Politecnico di Milano" (ScitechDaily, Freezing Positronium Atoms With Lasers To Unlock Secrets of Antimatter)



Positronium is a particle pair where normal negative electrons and electrons mirror particle anti-electron or positron orbit each other. There are tests where another particle's energy level has risen and that thing causes asymmetry in the orbiting speed. So in those cases, another particle can stop, and the other will start to orbit it. 

In some tests, the laser ray will shoot over the positron-electron pair vertically or horizontally. And that thing locks them into the static position. And that thing might have many uses in military and civil technology. 

Positronium is one of the artificial particle pairs. That thing is a combination of electrons and positrons that orbit each other. There is a model that positronium can used as qubits. In those cases, the quantum computer creates quantum entanglement between electron and positron. That kind of thing is one of the most ideal things to create the quantum entanglement. But the problem is that the positron is the electron's antiparticle. That means positron and electron have opposite polarity. And this opposite polarity makes them hard to control. 

"An electron and positron orbiting around their common centre of mass. An s state has zero angular momentum, so orbiting around each other would mean going straight at each other until the pair of particles is either scattered or annihilated, whichever occurs first. This is a bound quantum state known as positronium." (Wikipaedia, Positronium)


If electron and positron are in static positions the opposite polarity between electron and positron pulls them together, and that causes powerful annihilation. Otherwise, if the laser can freeze the positronium in a static position the positive and negative particles are ideal for qubits. 

The long-standing qubit is quite hard to make because when two heads of the quantum entanglement turn into the same energy level, they form a standing wave between them. And that breaks the qubit. But if the participants of the quantum entanglement have plus and minus polarity. That electromagnetic effect keeps them in form. And that's why electron and positron qubits can keep superposition longer than usual. 

In those tests, lasers make the quantum shadow that should lock the positronium in a static position. And then there is the possibility of creating quantum entanglement through that electromagnetic shadow. The system must keep positron and electron in static positions. Then at the begin of superposition, it must keep the positron away from the electron. In nature, the orbiting movement keeps electrons and positrons away from each other. 

In that case, the system must use some kind of magnets that pull the positron and electron away from each other. Or maybe the Hall field or potential barrier that formed between slowing particles can keep them away. Then the system must start to create superposition and entanglement. Then the system can keep the receiving part of that qubit in a little bit lower energy level than the transmitting part. 

https://scitechdaily.com/freezing-positronium-atoms-with-lasers-to-unlock-secrets-of-antimatter/

https://en.wikipedia.org/wiki/Positronium


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