Entanglement detection via continuous quantum channels

DURAN D., Vercin A., Yilmaz S.

PHYSICAL REVIEW A, cilt.90, sa.4, 2014 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 90 Sayı: 4
  • Basım Tarihi: 2014
  • Doi Numarası: 10.1103/physreva.90.042320
  • Dergi Adı: PHYSICAL REVIEW A
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Yozgat Bozok Üniversitesi Adresli: Evet

Özet

For any N circle times N-type bipartite system with even N > 2, two-parameter continuous families of unital block-dephasing quantum channels and of weakly optimal entanglement witnesses are constructed from special forms of a parametrized positive map. The parameter domains of the families are complementary subsets of a convex set and this fact reveals unusual combination rules of quantum channels and entanglement witnesses. These rules make it possible to develop many physically implementable direct entanglement-detection methods that provide a unified framework to accomplish both information-processing and entanglement-detection tasks by means of smooth quantum channels, without any reference to entanglement witnesses.