https://doi.org/10.1140/epjd/e2011-20335-5
Regular Article
Correlation between entanglement and spin density in nitrogen-vacancy center of diamond
1
Department of Physics, Sharif University of
Technology, P. O. Box:
11365-9161, Tehran,
Iran
2
Physics group, Maleke Ashtar University,
P. O. Box: 83145-115,
Isfahan, Shahin Shahr, Iran
3
Institute for Materials Research, Tohoku University,
Sendai
980-8577,
Japan
a e-mail: mohsenbabamoradi@yahoo.com
Received:
8
June
2011
Received in final form:
5
September
2011
Published online:
1
December
2011
Many-body wavefunctions were utilized to calculate von Neumann’s entropy as an entanglement measurement for neutral and negatively charged nitrogen vacancy (NV) centers in diamond. A generalized Hubbard Hamiltonian which considers e-e interaction terms completely was used to calculate many-electron wavefunctions of the ground and excited states. Correlation between entanglement and spin density distributed on neighboring atoms of NV is presented. The behavior of spin density and entanglement under relaxations of neighboring atoms is the same for all investigated ground and excited states. The results suggest that the spin density may be used to quantify the entanglemnt and vice versa.
© EDP Sciences, Società Italiana di Fisica and Springer-Verlag 2011
