Quantum metrology beyond the quantum Cramér-Rao theorem

@article{Seveso2017QuantumMB,
  title={Quantum metrology beyond the quantum Cram{\'e}r-Rao theorem},
  author={Luigi Seveso and Matteo A. C. Rossi and Matteo G. A. Paris},
  journal={Physical Review A},
  year={2017},
  volume={95},
  pages={012111-1-012111-7}
}
  • Luigi Seveso, Matteo A. C. Rossi, Matteo G. A. Paris
  • Published 2017
  • Physics
  • Physical Review A
  • A usual assumption in quantum estimation is that the unknown parameter labels the possible states of the system, while it influences neither the sample space of outcomes nor the measurement aimed at extracting information on the parameter itself. This assumption is crucial to prove the quantum Cramer-Rao theorem and to introduce the quantum Fisher information as an upper bound to the Fisher information of any possible measurement. However, there are relevant estimation problems where this… CONTINUE READING

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