Researchers realize long-lived storage of multimode quantum states

The University of Science and Technology of China is located in China.

A team led by Prof. Guo Guangcan achieved long-lived storage of OAM quantum states using a guiding magnetic field. The work was published in a journal.

Multimode memory can greatly improve channel capacity, which is important for long distance quantum communication. The cold atomic ensemble makes it an efficient medium for storing information. Although important progress has been made, many problems remain to be solved in long-lived spatial multimode memory based on cold atomic ensemble, one of which is how to achieve high fidelity for multimode memory after a long storage time.

The team used the cold 85Rb system to store high-dimensional multimode quantum states. To overcome the effect of inhomogeneous evolution due to the spatial complexity of stored OAM, the team used a guiding magnetic field to dominate atomic evolution. The lifetime of faithful storage was extended after the clock states were used.

The team extended the dimensions of stored OAM superposition states to three in the experiment and achieved fidelity that exceeds the quantum-classical criteria after a storage time of 400s. The fidelity barely decayed when the storage time was extended from 10s to 400s.

There is more information about the Long-Lived Memory for Orbital Brilliance. There is a book titled "PhysRevLett.129.1936-01."

Journal information: Physical Review Letters

It was provided by the University of Science and Technology of China.