Enhancement of Spin Qubits

We use lasers and microwave fields to manipulate the quantum state of optically-active spin qubits. Beyond the processing of quantum information, this manipulation can lead to the decoupling of the spin from its noisy environment, thereby prolonging the spins’ coherence times for quantum applications. The developed protocols must consider the noise sources in the environment as well as the imperfections caused by the experimental apparatus.


In the figure: design of robust pulse sequences with unique phases noted by the arrows, which resulted in the preservation of arbitrary quantum states of ensembles of NV color centers in diamond up to 30 milliseconds.

Promising research directions:

  • Development of robust protocols for improving the coherence properties of new systems.
  • Realization of protocols that read the quantum state of the spin in a single shot.

Related publications:

  • D. Farfurnik, R. M. Pettit, Z. Luo, and E. Waks. Single-Shot Readout of a Solid-State Spin in a Decoherence-Free Subspace. Phys. Rev. Applied 15, L031002 (2021).
  • D. Farfurnik, N. Alfasi, S. Masis, Y. Kauffmann, E. Farchi, Y. Romach, Y. Hovav, E. Buks, and N. Bar-Gill. Enhanced concentrations of nitrogen-vacancy centers in diamond through TEM irradiation. Appl. Phys. Lett. 111, 123101 (2017). Press Release.
  • D. Farfurnik, N. Aharon, I. Cohen, Y. Hovav, A. Retzker, and N. Bar-Gill. Experimental realization of time-dependent phase-modulated continuous dynamical decoupling. Phys. Rev. A 96, 013850 (2017).
  • D. Farfurnik, A. Jarmola, L. M. Pham, Z. H. Wang, V. V. Dobrovitski, R. L. Walsworth, D. Budker, and N. Bar-Gill. Optimizing a dynamical decoupling protocol for solid state electronic spin ensembles in diamond. Phys. Rev. B 92, 060301 (R) (2015).