Witnessing Macroscopic Entanglement in a Staggered Magnetic Field

Details Witnessing Macroscopic Entanglement in a Staggered Magnetic Field Witnessing Macroscopic Entanglement in a Staggered Magnetic Field

2007-01-02

arxiv.org/abs/quant-ph/0701013v2

Phys. Rev. A 76, 022319 (2007)

Physics

Quantum Physics

Accepted for publication in Physical Review A, minor changes from previous version. 5 pages, 3 figures

Scientific paper

10.1103/PhysRevA.76.022319

We investigate macroscopic entanglement in an infinite XX spin-1/2 chain with staggered magnetic field, B_l=B+e^{-i\pi l}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.

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