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Measuring quantumness: from theory to observability in interferometric setups

  • Leonardo Ferro
  • Rosario Fazio
  • Fabrizio Illuminati
  • Giuseppe Marmo
  • Saverio PascazioEmail author
  • Vlatko Vedral
Regular Article
  • 37 Downloads
Part of the following topical collections:
  1. Topical Issue: Quantum Correlations

Abstract

We investigate the notion of quantumness based on the noncommutativity of the algebra of observables and introduce a measure of quantumness based on the mutual incompatibility of quantum states. We show that such a quantity can be experimentally measured with an interferometric setup and that, when an arbitrary bipartition of a given composite system is introduced, it detects the one-way quantum correlations restricted to one of the two subsystems. We finally show that, by combining only two projective measurements and carrying out the interference procedure, our measure becomes an efficient universal witness of quantum discord and nonclassical correlations.

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Copyright information

© EDP Sciences, SIF, Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.INFN, Sezione di NapoliNapoliItaly
  2. 2.Morgan Stanley Analytics1095Hungary
  3. 3.Abdus Salam ICTPTriesteItaly
  4. 4.NEST, Scuola Normale Superiore & Istituto Nanoscienze-CNRPisaItaly
  5. 5.Dipartimento di Ingegneria IndustrialeUniversità di SalernoFisciano (SA)Italy
  6. 6.Dipartimento di FisicaUniversità di NapoliNapoliItaly
  7. 7.Dipartimento di Fisica and MECENASUniversità di BariBariItaly
  8. 8.Istituto Nazionale di Ottica (INO-CNR)FirenzeItaly
  9. 9.INFN, Sezione di Bari70126Italy
  10. 10.Clarendon Laboratory, Department of PhysicsUniversity of OxfordOxfordUK
  11. 11.Centre for Quantum TechnologiesNational University of SingaporeSingaporeSingapore
  12. 12.Department of PhysicsNational University of SingaporeSingaporeSingapore

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