Researchers at TU Wien for the first time have succeeded in coupling the defects in various diamonds using quantum physics.
For some time now, researchers at TU Wien have been studying the quantum properties of such diamonds, but only now have they succeeded in coupling the specific defects in two such diamonds with one another.
This defect, consisting of the nitrogen atom and vacancy, forms a quantum system with a very long-lasting state, making diamonds with these particular flaws ideally suited to quantum experiments.
For a number of years now, the team at TU Wien has been investigating how diamonds can be manipulated with the help of microwaves: “Billions of nitrogen-vacancy defects in diamonds are coupled collectively with a microwave field”, says Majer.
Now, the team has succeeded in taking the next step: they were able to couple two different diamonds, one at each end of the chip, thus producing an interaction between the two diamonds.
The coupling between the two diamonds can be switched on and off selectively: “The two diamonds are rotated against each other at a certain angle”, reports Thomas Astner, the lead author of the current work.
“Additionally, a magnetic field is applied, with the direction playing a decisive role: if both diamonds are aligned at the same angle within the magnetic field, then they can be coupled using quantum physics. With other magnetic field directions, it is possible to investigate the individual diamonds without coupling”.