Process reconstruction from incomplete and/or inconsistent data

  • M. Ziman
  • M. Plesch
  • V. BužekEmail author
Novel Schemes for Quantum Information Processing


We analyze how an action of a qubit channel (map) can be estimated from the measured data that are incomplete or even inconsistent. That is, we consider situations when measurement statistics is insufficient to determine consistent probability distributions. As a consequence either the estimation (reconstruction) of the channel completely fails or it results in an unphysical channel (i.e., the corresponding map is not completely positive). We present a regularization procedure that allows us to derive physically reasonable estimates (approximations) of quantum channels. We illustrate our procedure on specific examples and we show that the procedure can be also used for a derivation of optimal approximations of operations that are forbidden by the laws of quantum mechanics (e.g., the universal NOT gate).


Spectroscopy Neural Network State Physics Probability Distribution Complex System 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2005

Authors and Affiliations

  1. 1.Research Center for Quantum Information, Slovak Academy of SciencesBratislavaSlovakia
  2. 2.Faculty of Informatics, Masaryk UniversityBrnoCzech Republic

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