Level anti-crossings of an NV center in diamond: Decoherence-free subspaces and 3D sensors of microwave magnetic fields

Abstract

Nitrogen-vacancy (NV) centers in diamond have become an important tool for quantum technologies. All of these applications rely on long coherence times of electron and nuclear spins associated with these centers. Here, we study the energy level anti-crossings of an NV center in diamond coupled to a first-shell 13C nuclear spin in a small static magnetic field. These level anti-crossings occur for specific orientations of the static magnetic field due to the strong non-secular components of the Hamiltonian. At these orientations we observe decoherence-free subspaces, where the electron spin coherence times (T_2* ) are 5-7 times longer than those at other orientations. Another interesting property at these level anti-crossings is that individual transition amplitudes are dominated by a single component of the magnetic dipole moment. Accordingly, this can be used for vector detection of microwave magnetic fields with a single NV center. This is particularly important to precisely control the center using numerical optimal control techniques.

arXiv comment7 pages, 5 figures

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Cited by in corpus (7)

• Decoherence of Nuclear Spins in the Proximity of Nitrogen Vacancy Centers in Diamond
• Decoherence-free quantum register of nuclear spins in diamond
• Quantum Error Corrected Non-Markovian Metrology
• Vector detection of AC magnetic fields by Nitrogen-Vacancy centers of single orientation in diamond
• Maximizing information obtainable by quantum sensors through the Quantum Zeno Effect
• Rapid transform optimisation strategy for decoherence-protected quantum register in diamond
• Imaging of microwave magnetic field orientation using continuous-wave experiments on nitrogen-vacancy centers in diamond