Protecting a Diamond Quantum Memory by Charge State Control
At a Glance
Section titled āAt a Glanceā| Metadata | Details |
|---|---|
| Publication Date | 2017-09-05 |
| Journal | Nano Letters |
| Authors | Matthias Pfender, Nabeel Aslam, Patrick Simon, Denis Antonov, GergÅ Thiering |
| Institutions | HUN-REN Wigner Research Centre for Physics, Institut CatalĆ de NanociĆØncia i Nanotecnologia |
| Citations | 89 |
Abstract
Section titled āAbstractāIn recent years, solid-state spin systems have emerged as promising candidates for quantum information processing. Prominent examples are the nitrogen-vacancy (NV) center in diamond, phosphorus dopants in silicon (Si:P), rare-earth ions in solids, and V<sub>Si</sub>-centers in silicon-carbide. The Si:P system has demonstrated that its nuclear spins can yield exceedingly long spin coherence times by eliminating the electron spin of the dopant. For NV centers, however, a proper charge state for storage of nuclear spin qubit coherence has not been identified yet. Here, we identify and characterize the positively charged NV center as an electron-spin-less and optically inactive state by utilizing the nuclear spin qubit as a probe. We control the electronic charge and spin utilizing nanometer scale gate electrodes. We achieve a lengthening of the nuclear spin coherence times by a factor of 4. Surprisingly, the new charge state allows switching of the optical response of single nodes facilitating full individual addressability.