Entanglement of electron spins in superconductors

Sangchul Oh, Jaewan Kim

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23 Citations (Scopus)


We investigate entanglement of two electron spins forming Cooper pairs in an s -wave superconductor. The two-electron space-spin density matrix is obtained from the BCS ground state using a two-particle Green's function. It is demonstrated that a two spin state is not given by a spin singlet state but by a Werner state. It is found that the entanglement length, within which two spins are entangled, is not of the order of the coherence length but of the order of the Fermi wave length.

Original languageEnglish
Article number144523
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number14
Publication statusPublished - 15 Dec 2005
Externally publishedYes


ASJC Scopus subject areas

  • Condensed Matter Physics

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