Entanglement of electron spins in superconductors

Sangchul Oh; Jaewan Kim

doi:10.1103/PhysRevB.71.144523

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Entanglement of electron spins in superconductors

Sangchul Oh, Jaewan Kim

DOI 10.1103/PhysRevB.71.144523 · Physical Review B

T1

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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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Al Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown