Dissipative adiabatic measurements: Beating the quantum Cramér-Rao bound

  title={Dissipative adiabatic measurements: Beating the quantum Cram{\'e}r-Rao bound},
  author={Da-Jian Zhang and Jiangbin Gong},
  journal={arXiv: Quantum Physics},
It is challenged only recently that the precision attainable in any measurement of a physical parameter is fundamentally limited by the quantum Cramer-Rao Bound (QCRB). Here, targeting at measuring parameters in strongly dissipative systems, we propose an innovative measurement scheme called {\it dissipative adiabatic measurement} and theoretically show that it can beat the QCRB. Unlike projective measurements, our measurement scheme, though consuming more time, does not collapse the measured… 
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Science 339
  • 178
  • 2013
  • Rev. Lett. 72, 3439
  • 1994
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  • 1993
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