Date of Birth: 
Place of Birth: Herford, North Rhine-Westphalia, Germany
About Jörg Wrachtrup
- Jörg Wrachtrup (born 27 December 1961) is a German physicist. While working on his PhD thesis, he carried out the first electron spin resonance experiments on single electron spins.
- The work was done in close collaboration with and in the lab of M.
- Orrit at the CNRS Bordeaux.
- In the course of these studies also the first coherent experiments on single electron spins in a solid were successful.
- In subsequent investigations even electron nuclear double resonance which mark the first experiments on single nuclei has been achieved.
- While working at the Chemnitz University of Technology, he headed a research team that has, for the first time, detected the optical signal of a single defect center.
- The particular defect was the nitrogen-vacancy center (N-V) in diamond.
- This pioneering work has created standards for numerous follow-up studies of individual N-V centers aiming at manipulations of individual nuclear spins in solids (quantum computer).
- All of the above achievements combined the following essential elements: N-V centers were produced in sufficiently low concentrations, so that separation between the centers exceeded several micrometers, and individual centers could be detected using a "conventional" scanning confocal optical microscope. Photoluminescence and electron paramagnetic resonance techniques were combined into optically detected magnetic resonance, detected from a single center.The authors of the paper being experience in single molecule magnetic resonance deliberately were choosing a defect center with an electron paramagnetic ground state.
- By this they achieved room temperature single electron spin resonance.
- In addition the defect center proved to be unconditionally photostable, in contrast to most other single quantum emitters.
- This discovery is the basis for numerous applications of defects in diamond as single photon source, quantum register and in magnetometry.
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