2021-11-26

Making matter invisible: MIT physicists successfully demonstrate the “Pauli blocking” effect

By yqqlm yqqlm

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scientists think it can be used to prevent data from leaking out of quantum computers. Other researchers conducted similar experiments and published their findings in three independent papers

the process witnessed by MIT researchers is called Pauli blocking. It is based on Pauli’s exclusion principle. This principle was first proposed by Austrian physicist Wolfgang Pauli in 1925. Pauli assumes that fermion particles such as protons, electrons and neutrons with the same quantum state cannot exist in the same space

this exclusion principle also applies to atoms in gas, which is what scientists use to prove it. Usually, atoms in gas clouds have a lot of space to move. When a proton or a light particle is sent into a cloud, the atom that hits it will interact with it. They absorb the momentum of the particles, which causes them to recoil at different energy levels. Then it scatters the picture

in order to make invisible gas, scientists have to do the opposite. Instead, they cool the atoms. The atoms then lose energy, which causes them to form a substance called the Fermi sea. The atoms are surrounded by each other. This prevents them from moving or falling in energy levels. At this point, the particles are so dense that atoms cannot interact with the particles sent into light. Then the light was blocked by Pauli and passed smoothly

how scientists make invisible gas

4da38a8f11a7e57 - Making matter invisible: MIT physicists successfully demonstrate the "Pauli blocking" effect

in order to make the gas invisible, MIT researchers based on the idea of Pauli blocking. Then they adjusted the pictures in the laser beam so that they collided only with atoms moving in the opposite direction, slowing them down and cooling them down. After that, they frozen the lithium gas cloud to a temperature of 20 micro Kelvin – slightly above absolute zero

then, the researchers used a second, more closely focused laser to squeeze the atoms together. They squeezed them to a density of about 1 trillion atoms per cubic centimeter, a new record. Finally, they used a third laser to shoot the beam into the gas. As they predicted, these atoms scatter 38% less light than atoms at room temperature

now scientists have proved how the Pauli blocking effect works. It, um, can be used to develop invisible substances that inhibit light. Companies like Google trying to develop new technologies for quantum computers can use this to help improve their efficiency