A rare quantum leap

Single rare-earth ions are hard to observe and even harder to use as qubits. However, with the help of coupling to an optical cavity and clever engineering of selection rules, a big step has been taken to establish their new role in the quantum world.


The solid lines mark the spin-conserving optical transitions enhanced by the cavity-atom coupling, while the dotted lines are the spin-non-conserving transitions. B, external magnetic field in the direction facilitating spin-conserving optical transitions.

Read the full article at: https://www.nature.com/articles/s41567-020-0871-3?utm_source=nphys_etoc&utm_medium=email&utm_campaign=toc_41567_16_5&utm_content=20200507&sap-outbound-id=3E0A30B6A789DDA060559C5F2FFA608532801543