By the same authors

From the same journal

From the same journal

Quantification of gaussian quantum steering

Research output: Contribution to journalArticle

Published copy (DOI)


  • Ioannis Kogias
  • Antony R. Lee
  • Sammy Ragy
  • Gerardo Adesso


Publication details

JournalPhys. Rev. Lett.
DatePublished - 12 Feb 2015
Issue number6
Number of pages6
Pages (from-to)1-6
Original languageEnglish


Einstein-Podolsky-Rosen steering incarnates a useful nonclassical correlation which sits between entanglement and Bell nonlocality. While a number of qualitative steering criteria exist, very little has been achieved for what concerns quantifying steerability. We introduce a computable measure of steering for arbitrary bipartite Gaussian states of continuous variable systems. For two-mode Gaussian states, the measure reduces to a form of coherent information, which is proven never to exceed entanglement, and to reduce to it on pure states. We provide an operational connection between our measure and the key rate in one-sided device-independent quantum key distribution. We further prove that Peres' conjecture holds in its stronger form within the fully Gaussian regime: namely, steering bound entangled Gaussian states by Gaussian measurements is impossible.

Discover related content

Find related publications, people, projects, datasets and more using interactive charts.

View graph of relations