Entanglement of electron spins in superconductors

Sangchul Oh, Jaewan Kim

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

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
Volume71
Issue number14
DOIs
Publication statusPublished - 15 Dec 2005
Externally publishedYes

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electron spin
Superconducting materials
Electrons
Green's function
Ground state
Wavelength
Green's functions
ground state
electrons

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Entanglement of electron spins in superconductors. / Oh, Sangchul; Kim, Jaewan.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 71, No. 14, 144523, 15.12.2005.

Research output: Contribution to journalArticle

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