Miniaturization and Industrialization of Quantum Memories: A Pivotal Shift

Quantum technologies are poised to revolutionize the way we exchange information. At the forefront of this revolution, a team of researchers at the University of Basel, led by Professor Philipp Treutlein, has made a significant step forward by developing a quantum memory element that is potentially suitable for mass production.


Their invention is based on the use of photons, which are ideal particles of light for transmitting quantum information. In their study published in the journal Physical Review Letters, they describe how they have managed to store and retrieve quantum information in a cell a few millimeters in size (about 0.1 to 0.4 inches), filled with rubidium atoms, with a process that's scalable for industrial production.

To get enough rubidium atoms, the researchers heat the cell to 212°F (about 100°C). This increase in temperature raises the pressure, allowing for an adequate density of atoms for quantum storage. In addition to heat, a magnetic field with an intensity of 1 tesla, far above the Earth's magnetic field, is employed. This field alters the atomic energy levels, facilitating the storage of photons with the aid of an additional laser beam.

This advancement paves the way for the mass production of about 1000 quantum memories on a single wafer, a significant leap toward the practical application of these technologies. The next step for Treutlein's team will be to store individual photons in these miniature cells, while optimizing their design to prolong photon storage and preserve their quantum states.