Witnessing pairing correlations in identical-particle systems

Aksak C., TURGUT S.

Quantum Information and Computation, vol.21, no.15-16, pp.1307-1319, 2021 (SCI-Expanded) identifier

  • Publication Type: Article / Article
  • Volume: 21 Issue: 15-16
  • Publication Date: 2021
  • Doi Number: 10.26421/qic21.15-16-4
  • Journal Name: Quantum Information and Computation
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, zbMATH
  • Page Numbers: pp.1307-1319
  • Keywords: Entanglement, Pairing, Quantum correlations
  • Middle East Technical University Affiliated: Yes


© Rinton Press.Quantum correlations and entanglement in identical-particle systems have been a puz-zling question which has attracted vast interest and widely different approaches. Witness formalism developed first for entanglement measurement can be adopted to other kind of correlations. An approach is introduced by Kraus et al., [Phys. Rev. A 79, 012306 (2009)] based on pairing correlations in fermionic systems and the use of witness formalism to detect pairing. In this contribution, a two-particle-annihilation operator is used for constructing a two-particle observable as a candidate witness for pairing correlations of both fermionic and bosonic systems. The corresponding separability bounds are also obtained. Two different types of separability definition are introduced for bosonic systems and the separability bounds associated with each type are discussed.