Numerical Simulation of NV Quantum Spin Dynamics using QuTIP

Nitrogen-vacancy (NV) centers, defects in diamond lattices whose quantum properties can be manipulated using an external magnetic field, are popular in solid-state magnetometry and quantum sensing for their high sensitivity and long coherence times. Typically, NV centers are treated experimentally as two-level systems, considering only the spin = 0 and spin = +1 or -1 cases. However, the full spin-1 multiplet can be exploited to increase sensitivity in AC magnetometry by taking into consideration all three possible orientations of the NV electronic spin, a method referred to double-quantum coherence. This project explores various numerical simulations of magnetic pulse sequences for AC magnetometry via double-quantum coherence using QuTip (qutip.org), a quantum computing package for Python, with the aim of developing techniques to efficiently model double-quantum coherence in NV centers.