Optimal estimation of joint parameters in phase space Academic Article uri icon


  • We address the joint estimation of the two defining parameters of a displacement operation in phase space. In a measurement scheme based on a Gaussian probe field and two homodyne detectors, it is shown that both conjugated parameters can be measured below the standard quantum limit when the probe field is entangled. We derive the most informative Cramr-Rao bound, providing the theoretical benchmark on the estimation, and observe that our scheme is nearly optimal for a wide parameter range characterizing the probe field. We discuss the role of the entanglement as well as the relation between our measurement strategy and the generalized uncertainty relations. 2013 American Physical Society.

published proceedings


altmetric score

  • 0.75

author list (cited authors)

  • Genoni, M. G., Paris, M., Adesso, G., Nha, H., Knight, P. L., & Kim, M. S.

citation count

  • 99

complete list of authors

  • Genoni, MG||Paris, MGA||Adesso, G||Nha, H||Knight, PL||Kim, MS

publication date

  • January 2013