Quantum Sensing

The energy levels of spin qubits can shift due to the presence of external physical forces and fields such as magnetic and electric fields, strain, and temperature. As such, optically-active spin qubits are widely used as sensors of external forces and fields produced in physical, biological, chemical, and geological specimens. We use lasers and microwave fields to measure optically-active spin qubits and perform such sensing. We are also interested in performing quantum sensing, namely utilizing highly entangled “spin-squeezed” states to develop sensors whose capabilities scale better than the ones of classical sensors.


In the figure: vectorial magnetic sensing of multi-domain dendrites in rock forming minerals utilizing ensembles of NV color centers in diamond.

Promising research directions:

  • Utilizing optically-active spins as sensors to study physical, biological, chemical, and geological systems.
  • Utilizing spin-squeezed states to demonstrate sensing beyond classical limits.

Related publications:

  • D. Farfurnik, A. Jarmola, D. Budker, and N. Bar-Gill. Spin ensemble-based AC magnetometry using concatenated dynamical decoupling at low temperatures. J. Opt. 20 024008 (2018).
  • E. Farchi, Y. Ebert, D. Farfurnik, G. Haim, R. Shaar, and N. Bar-Gill. Quantitative Vectorial Magnetic Imaging of Multi-Domain Rock Forming Minerals Using Nitrogen-Vacancy Centers in Diamond. SPIN 07, 1740015 (2017).