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Scientists increased the quantum memory capacity to a record level

Scientists increased the quantum memory capacity to a record level

Scientists from the University of Warsaw were able to save 665 quantum states of light simultaneously, thus setting a new record.

This result was achieved thanks to the use of laser-cooled atoms.

Researchers used a system of space division multiplexing in their experiment. It is built on a magneto-optical trap – a group of rubidium atoms is cooled by lasers in a magnetic field to the temperature of 20 microkelvins.

Photons are scattered when the atoms are illuminated by a laser beam. And all these photons move in different directions, which are fixed by a special camera. The obtained data is stored as spin waves. Thanks to the correlation between the angles of photon emission obtained during recording and reading, it is confirmed that the memory is quantum, and the state of light can not be described by the laws of traditional optics.