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内容記述 |
The Nitrogen-Vacancy (NV) center in diamond is applied as quantum sensor for magnetic fields, temperature, electric field, etc. Quantum sensing based on an entangled state between dipole coupled NV center pair can overcome standard quantum limit to reach Heisenberg limit. It is expected to be more sensitive measurement than quantum sensing based on single NV center. Even though the generation of entangled state has been demonstrated by Double Electron-Electron Resonance (DEER)1,2, the utilization of entanglement state for enhancement of quantum sensing has not yet been studied. To realize the quantum sensing based on entangled state, we have developed organic compound ion implantation3,4 method to efficiently create dipole coupled NV centers. We reported the creation of NV center pair with dipole-dipole interaction strengths of about 100 kHz by using C5N4Hn ion implantation and pointed out the potential of entangled state with high fidelity (~0.9) at 5th IFQMS. In this study, we will report the generation of quantum entangled states between NV center pair and discuss the magnetic field sensing by using entangled state. |
