| Abstract: |
- The Nitrogen-vacancy (NV) center in diamond is considered to be a promising candidate for quantum
sensing and for quantum information processing. This is because at room temperature its S=1 electronics
spin triplet is easily polarized to the ms =0 state by exposure to green light. The intensity of the resulting
light emission provides a readout method for the degree of this spin polarization. The relatively long
coherence time of the electronic spin can be utilized for quantum sensing of minute electromagnetic fields
at the nanometer scale, as well as for quantum information processing. The natural splitting of 2.83 GHz
between the ms=±1 and ms=0 state provides a tool for coherent control of the electronic spin using
microwave radiation. Full control, requires, however, external magnetic field, which removes the
degeneracy between the ms=±1 spin states. Moreover, for precise control, the magnetic field should be
directed along the NV symmetry axis (111 and equivalent diamond crystallographic axes). We explore the
use of polarized microwave radiation for coherent control of the ms=±1 spin states of the NV center, at
vanishing external magnetic fields. This ability is important when working in amorphous samples of nanoor polycrystalline-
- diamonds or for other applications that require zero external magnetic fields.
The polarized microwave radiation, provides means for selective addressing the ms=±1 levels using the ms=0
as auxiliary level. We demonstrate schemes for achieving universal gates, and study the decoherence time
of this ms=±1 two level system (qubit).
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