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Title: Witnessing macroscopic entanglement in a staggered magnetic field
Authors: Hide, J.
Son, W.
Lawrie, I.
Vedral, V. 
Issue Date: 20-Aug-2007
Citation: Hide, J., Son, W., Lawrie, I., Vedral, V. (2007-08-20). Witnessing macroscopic entanglement in a staggered magnetic field. Physical Review A - Atomic, Molecular, and Optical Physics 76 (2) : -. ScholarBank@NUS Repository.
Abstract: We investigate macroscopic entanglement in an infinite XX spin- 1 2 chain with staggered magnetic field, Bl =B+ e-iπl b. Using single-site entropy and by constructing an entanglement witness, we search for the existence of entanglement when the system is at absolute zero, as well as in thermal equilibrium. Although the role of the alternating magnetic field b is, in general, to suppress entanglement as do B and T, we find that when T=0, introducing b allows the existence of entanglement even when the uniform magnetic field B is arbitrarily large. We find that the region and the amount of entanglement in the spin chain can be enhanced by a staggered magnetic field. © 2007 The American Physical Society.
Source Title: Physical Review A - Atomic, Molecular, and Optical Physics
ISSN: 10502947
DOI: 10.1103/PhysRevA.76.022319
Appears in Collections:Staff Publications

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