The landscape of quantum transitions driven by single-qubit unitary transformations with implications for entanglement

Renan Cabrera, Herschel Rabitz

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

This paper considers the control landscape of quantum transitions in multi-qubit systems driven by unitary transformations with single-qubit interaction terms. The two-qubit case is fully analyzed to reveal the features of the landscape including the nature of the absolute maximum and minimum, the saddle points and the absence of traps. The results permit calculating the Schmidt state starting from an arbitrary two-qubit state following the local gradient flow. The analysis of multi-qubit systems is more challenging, but the generalized Schmidt states may also be located by following the local gradient flow. Finally, we show the relation between the generalized Schmidt states and the entanglement measure based on the Bures distance.

Original languageEnglish (US)
Article number275303
JournalJournal of Physics A: Mathematical and Theoretical
Volume42
Issue number27
DOIs
StatePublished - Nov 23 2009

All Science Journal Classification (ASJC) codes

  • Statistical and Nonlinear Physics
  • Statistics and Probability
  • Modeling and Simulation
  • Mathematical Physics
  • Physics and Astronomy(all)

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