Volume 86, Number 4, May 2009
|Number of page(s)||5|
|Published online||29 May 2009|
Entanglement of electron pairs extracted from a many-body system
Faculty of Mathematics and Physics, University of Ljubljana - Ljubljana, Slovenia, EU
2 Jožef Stefan Institute - Ljubljana, Slovenia, EU
Corresponding author: email@example.com
Accepted: 29 April 2009
Entanglement of spins is analyzed for two electrons extracted from a mixed many-electron state by projecting onto the two-electron subspace. The concurrence formulae are expressed in a compact form for states with a well-defined square of the total spin projection. As an example, the thermal entanglement for a qubit pair with an anisotropic Heisenberg and the Dzyaloshinskii-Moriya interactions in an inhomogeneous magnetic field is given analytically. Remarkably, the concurrence of a pair of electrons with antiparallel spins and in a delocalised orbital state is given by the scalar product of the state with its spin-flipped state and not with the time-reversed state.
PACS: 03.67.Mn – Entanglement measures, witnesses, and other characterizations / 73.21.La – Quantum dots / 03.67.Bg – Entanglement production and manipulation
© EPLA, 2009
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