| Issue |
EPL
Volume 86, Number 4, May 2009
|
|
|---|---|---|
| Article Number | 40003 | |
| Number of page(s) | 5 | |
| Section | General | |
| DOI | https://doi.org/10.1209/0295-5075/86/40003 | |
| Published online | 29 May 2009 | |
Entanglement of electron pairs extracted from a many-body system
1
Faculty of Mathematics and Physics, University of Ljubljana - Ljubljana, Slovenia, EU
2
Jožef Stefan Institute - Ljubljana, Slovenia, EU
Corresponding author: anton.ramsak@fmf.uni-lj.si
Received:
10
February
2009
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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