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Spin ensembles in diamond for sensing and many-body physics


  Demitry Farfurnik [1,2]  ,  Nir Bar-Gill [1,2,3]  
 [1] Racah Institute of Physics, The Hebrew University of Jerusalem
[2] The Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem
[3] Dept. of Applied Physics, Rachel and Selim School of Engineering, The Hebrew University of Jerusalem

The unique spin and optical properties of the nitrogen-vacancy (NV) color centers in diamond position them as leading candidates for robust qubits and magnetic nano-sensors. In this talk, I will describe our work on ensembles of NV centers for sensing and the studies of many-body Physics. We enhance the NV concentrations and coherence times by combining electron irradiation with TEM [1], and dynamical decoupling techniques adapted from NMR [2], which leads to enhanced magnetic sensing [3]. Furthermore, we show that the application of additional (WAHUHA-based) pulse sequences could determine and decouple dominant interaction sources in the ensemble [4]. Finally, I will present our idea and current experimental status of NV-NV many-body Hamiltonian engineering, which could result in the creation of  non-classical states, e.g. spin-squeezed states, which could eventually lead to magnetic sensing beyond the standard quantum limit (SQL)

 

[1] D. Farfurnik et al., Appl. Phys. Lett. 111, 123101

[2] D. Farfurnik et al., Phys. Rev. B 92, 060301(R)

[3] D. Farfurnik, A. Jarmola, D. Budker and N. Bar-Gill, J. Opt. 20 024008

[4] D. Farfurnik, Y. Horowicz and N. Bar-Gill, Phys. Rev. A 98, 033409