Nell diamond is a diamond, it's just small. The size is about 100 nanometer. So basically we use a very tiny forward laser beam to levitate the narrow diamond. We try to control the spin of levitate narrow diamond inside a vacuum chamber and we study this effect in different conditions. And we learned that the signal that amused from the nitrogen vacuum center depend on the serrated gas. This following suggests that you can use nitrogen vacuum center for gas sensing applications, for example, oxygen gas sensing. Normally when you think about quantum physics you think about atom, a very, very small object. But now we hope that we can test quantum physics at a little bit more macroscopic level using nano particle.