Every generalized cat state achieves the ultimate scaling sensitivity in quantum metrology

  title={Every generalized cat state achieves the ultimate scaling sensitivity in quantum metrology},
  author={Mamiko Tatsuta and Yuichiro Matsuzaki and Akira Shimizu},
We show a general relationship between a superposition of macroscopically distinct states and sensitivity in quantum metrology. Generalized cat states are defined by using an index which extracts the coherence between macroscopically distinct states, and a wide variety of states including classical mixture of exponentially large number of states have been identified as the generalized cat state with this criterion. We find that, if we use the generalized cat states for magnetic field sensing… 

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