The nitrogen defect (NV) center is a promising quantum system with wide applications. In addition to quantum information technology, it is particularly used as a quantum magnetic sensor [1, 2, 3]. Although previous research has demonstrated the high potential of an NV-based sensor, complete sensor systems have rarely been practically realized.

In one project, we are developing such a measurement system towards application, e.g. in biomedicine. To this end, we are investigating technologies with which the components of the diamond magnetometer can be integrated into a compact and practical device.

Lock-In Amplifier Signal
Noise density of an in-phase lock-in amplifier signal at resonance (inset), converted to units of magentic field for a time constant of 100 ms [3].


  1. L. Rondin et al. Magnetometry with nitrogen-vacancy defects in diamondRep. Prog. Phys. 77, 056503 (2014)
  2. V. M. Acosta et al. Broadband magnetometry by infrared-absorption detection of nitrogen-vacancy ensembles in diamond, Appl. Phys. Lett. 97, 174104 (2010)
  3. H. Clevenson et al. Broadband magnetometry and temperature sensing with a light-trapping diamond waveguide, Nature Phys 11, 393–397 (2015)