A simple theoretical scheme with respect to preparing the maximum entanglement of a nitrogen‐vacancy (NV) spin and the quantized nanotubes carried with the tunable direct current is studied in this work. Basing on its inherent ℤ2 symmetry of the general Jaynes–Cummings model in this spin–phonon coupling system, two special adiabatic channels to bridge the initial discrete ground states and the final ground states with the maximum entanglement are discussed. To further supplement this scheme, we also discuss another equivalent and suitable setup, namely the NV spin and surface acoustic wave strong strain coupling scheme. Owing to adiabaticity, this scheme may be considered as an encouraged attempt for preparing the nonclassical state utilizing the systemic symmetry.
The magnetic fields with the first-and second-order gradient are engineered in several mechanically controlled hybrid systems. The current-carrying nanowires with different geometries can induce a tunable magnetic field gradient because of their geometric symmetries, and therefore develop various couplings to nitrogen-vacancy (NV) centers. For instance, a straight nanowire can guarantee the Jaynes-Cummings (JC) spin-phonon interaction and may indicate a potential route towards the application on quantum measurement. Especially, two parallel straight nanowires can develop the coherent down-conversion spin-phonon interaction through a second-order gradient of the magnetic field, and it can induce a bundle emission of the antibunched phonon pairs via an entirely different magnetic mechanism. Maybe, this investigation is further believed to support NV's future applications in the area of quantum manipulation, quantum sensing, and precision measurement, etc.
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