Phys.org June 16, 2022
Researchers in Japan have developed a new method for implementing magnetic field measurements in nitrogen-vacancy centers. The spin state of an extra electron at this site can be read or coherently manipulated using pulses of light. They used an “inverse Cotton-Mouton” effect to test their method. They used light of different polarizations to create tiny controlled local magnetic fields. They have demonstrated that by measuring the orientation of coherent spins inside a diamond lattice, the magnetic fields can be measured even over very short times. The team hopes that this work will help enable quantum spintronic computers that are sensitive spin states, not just electrical charge as with current computers. It may also enable new experiments to observe dynamic changes in magnetic fields or possibly even single spins under realistic device-operating conditions…read more. Open Access TECHNICAL ARTICLE
The peak amplitude of the Δθk signal as a function of the pump-polarization state (helicity) for different diamond samples. Credit: APL Photonics, Volume 7, Issue 6, 2022.Â