In recent years,optomechanical feedback cooling technology has played an important role in both the optomechanical measurement and realizing macroscopic quantum superpositions.But conventional feedback cooling techniques are limited by measurement noise.Recent research has combined and optimized the vector detection feedback cooling and the parametric squeezing at the same time.It not only breaks through the precision limit of the traditional feedback cooling technology,but also breaks through the 3 dB limit of the parametric squeezing.The mechanical thermal noise has been suppressed by more than 30 dB.
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