Pulsed characteristic-function measurement of a thermalizing harmonic oscillator

  title={Pulsed characteristic-function measurement of a thermalizing harmonic oscillator},
  author={Ralf Betzholz and Yu Liu and Jianming Cai},
  journal={Physical Review A},
We present a method for the direct measurement of the Wigner characteristic function of a thermalizing harmonic oscillator that is completely inaccessible for control or measurement. The strategy employs a recently proposed probe-measurement-based scheme [Phys. Rev. Lett. 122, 110406 (2019)] which relies on the pulsed control of a two-level probe. We generalize this scheme to the case of a nonunitary time evolution of the target harmonic oscillator, describing its thermalization through contact… 

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