Volume 89, Number 4, February 2010
|Number of page(s)||6|
|Published online||23 February 2010|
On reduced density matrices for disjoint subsystems
Research Institute for Solid State Physics and Optics - H-1525 Budapest, P.O.Box 49, Hungary
2 Institute of Theoretical Physics, Szeged University - H-6720 Szeged, Hungary
3 Fachbereich Physik, Freie Universität Berlin - Arnimallee 14, D-14195 Berlin, Germany
Corresponding author: firstname.lastname@example.org
Accepted: 28 January 2010
We show that spin and fermion representations for solvable quantum chains lead in general to different reduced density matrices if the subsystem is not singly connected. We study the effect for two sites in XX and XY chains as well as for sublattices in XX and transverse Ising chains.
PACS: 03.65.Ud – Entanglement and quantum nonlocality (e.g. EPR paradox, Bell's inequalities, GHZ states, etc.) / 03.67.Mn – Entanglement measures, witnesses, and other characterizations / 75.10.Pq – Spin chain models
© EPLA, 2010
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