Entanglement of electron spins in superconductors

Details Entanglement of electron spins in superconductors Entanglement of electron spins in superconductors

2004-06-02

arxiv.org/abs/quant-ph/0406013v1

Physical Review B 71, 144523 (2005)

Physics

Quantum Physics

4 pages, 2 eps figures

Scientific paper

10.1103/PhysRevB.71.144523

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 the order of the coherence length but the order of the Fermi wave length.

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