Mach-Zehnder interferometry with interacting trapped Bose-Einstein condensates

  title={Mach-Zehnder interferometry with interacting trapped Bose-Einstein condensates},
  author={Julian Grond and Ulrich Hohenester and J{\"o}rg Schmiedmayer and Augusto Smerzi},
  journal={Physical Review A},
We theoretically analyze a Mach-Zehnder interferometer with trapped condensates and find that it is surprisingly stable against the nonlinearity induced by interparticle interactions. The phase sensitivity, which we study for number-squeezed input states, can overcome the shot noise limit and be increased up to the Heisenberg limit provided that a Bayesian or maximum-likelihood phase estimation strategy is used. We finally demonstrate the robustness of the Mach-Zehnder interferometer in the… 

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