In New Milestone, physicists store and transport light using quantum memory


The storage and transfer of information is a fundamental part of any computing system, and quantum computing systems are no different – if we are going to benefit from the speed and security of quantum computers and quantum internet, then we need to find out How to move quantum data around.

One of the ways in which scientists are making contact with this is through optical quantum memory, or using light to store light as a map of particle states, and researchers are looking for a mile in this area A new study report on the saying of stone: successful storage and transfer of light quantum memory.

Researchers were not able to move light too far – just 1.2 millimeters or 0.05 inches – but the process outlined here could form the foundation for future quantum-powered computers and communications systems.

To achieve the feat, scientists used ultra-cold rubidium-87 atoms as a storage medium for light, offering high levels of both efficiency and lifetime – something that quantum physicists have always wanted to maximize. Is struggling for

The particle of light between the atoms’ electrons is effectively mapped to states of excitation. This creates an electron-photon partnership called a polarity, allowing light to be stored in the electron hum of an atom. An optical conveyor belt was then used to move atoms from one place to another with their cargo of light.

“We stored the light by placing it in a suitcase so to speak, only so much so that in our case this suitcase was made up of a cloud of cold atoms,” says physicist Patrick Windzinger of the University of Mainz, Germany. “We moved this suitcase a short distance and then moved the light out again.

“This is very interesting not only for physics in general, but also for quantum communication, because light is not very easy to ‘capture’, and if you want to transport it elsewhere in a controlled way, it will usually But ending. ”

The setup that has come here with Windpassinger and his colleagues means that light can be carried with little effect on its properties – which is very important if you want to move information from one point to another.

The work is based on a similar technique known as electromagnetically induced transparency or EIT, where atoms can be used as traps of light pulses and storage of maps. As the process is reversible, those light pulses may be regained in the future.

What’s new here is that the EIT itself is optimized to move light at greater distances than the size of the storage medium. The light is not only being packed inside a suitcase and retrofitted, it is also being moved – this is not easy to do while avoiding a rise in temperature or any change inside the suitcase.

As you would expect with such innovation, it would be practical to go a long way before that, and researchers now want to try to increase the storage capacity and travel distance of their systems.

One of the areas of research where the approach may be useful is in developing racetrack memory, an experimental type of data storage that promises major upgrades on the speed and performance of the devices we have today. Enabling storage and shift light may be enough to solve some of the development problems that have been encountered so far as racetrack memory.

The researchers wrote in their paper, “A racetrack memory reaches for light with various readings and writing sections, extending experimental protocols in the future.”

The research has been published in Physical review letter.

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