Tight bound on finite-resolution quantum thermometry at low temperatures

@article{Jorgensen2020TightBO,
  title={Tight bound on finite-resolution quantum thermometry at low temperatures},
  author={Mathias R. Jorgensen and Patrick P. Potts and M. Paris and J. B. Brask},
  journal={arXiv: Quantum Physics},
  year={2020}
}
Precise thermometry is of wide importance in science and technology in general and in quantum systems in particular. Here, we investigate fundamental precision limits for thermometry on cold quantum systems, taking into account constraints due to finite measurement resolution. We derive a tight bound on the optimal precision scaling with temperature, as the temperature approaches zero. The bound can be saturated by monitoring the non-equilibrium dynamics of a single-qubit probe. We support this… Expand
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