Manipulating the quantum systems with high precision is the everlasting persuit of physicists and engineers. Now the world has witnessed tremendous progresses along this road. To name a few, last year, LIGO team detected for the first time in human history the rythm of two dancers whose distance from us is out of imagination, and this achievement is due to the high precision cotrol and measurement of opto-mechanical system. The other example is the atomic clock. The development of atomic clock has made time the most precise physical quantity that we can measure.

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