Collisional Quantum Thermometry.

  title={Collisional Quantum Thermometry.},
  author={Stella Seah and Stefan Nimmrichter and Daniel Grimmer and Jader P. Santos and Valerio Scarani and Gabriel T. Landi},
  journal={Physical review letters},
  volume={123 18},
We introduce a general framework for thermometry based on collisional models, where ancillas probe the temperature of the environment through an intermediary system. This allows for the generation of correlated ancillas even if they are initially independent. Using tools from parameter estimation theory, we show through a minimal qubit model that individual ancillas can already outperform the thermal Cramer-Rao bound. In addition, due to the steady-state nature of our model, when measured… 

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