The asymptotic role of entanglement in quantum metrology

  title={The asymptotic role of entanglement in quantum metrology},
  author={Remigiusz Augusiak and Jan Kołodyński and Alexander Streltsov and Manabendra N Bera and Antonio Ac{\'i}n and Maciej Lewenstein},
  journal={arXiv: Quantum Physics},
Quantum systems allow one to sense physical parameters beyond the reach of classical statistics---with resolutions greater than $1/N$, where $N$ is the number of constituent particles independently probing a parameter. In the canonical phase estimation scenario the Heisenberg Limit $1/N^{2}$ may be reached, which requires, as we show, both the relative size of the largest entangled block and the geometric measure of entanglement to be nonvanishing as $N\!\to\!\infty$. Yet, we also demonstrate… Expand

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