Quantum back-action evasion via coherent feedback control: A geometric control approach

  title={Quantum back-action evasion via coherent feedback control: A geometric control approach},
  author={Yu Yokotera and Naoki Yamamoto},
  journal={2016 IEEE 55th Conference on Decision and Control (CDC)},
Engineering a detector for sensing an extremely tiny signal such as the gravitational-wave force is a very important subject in quantum physics. A major obstacle towards this goal is that, in the standard detection scheme, the measurement noise is lower bounded by the so-called standard quantum limit (SQL), which is originated from the intrinsic measurement back-action. Hence the detector system has to be carefully engineered so that it evades the back-action and eventually beats the SQL… CONTINUE READING

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