Entanglement Transfer Through an Antiferromagnetic Spin Chain

Details Entanglement Transfer Through an Antiferromagnetic Spin Chain Entanglement Transfer Through an Antiferromagnetic Spin Chain

2007-06-28

arxiv.org/abs/0706.4176v4

Advances in Mathematical Physics, Vol: 2010, 127182 (2010)

Physics

Quantum Physics

5 pages, 5 figures. Modified version with more explanation

Scientific paper

We study the possibility of using an uniformly coupled finite antiferromagnetic spin-1/2 Heisenberg chain as a channel for transmitting entanglement. One member of a pair of maximally entangled spins is initially appended to one end of a chain in its ground state and the dynamical propagation of this entanglement to the other end is calculated. We show that compared to the analogous scheme with a ferromagnetic chain in its ground state, here the entanglement is transmitted faster, with less decay, with a much higher purity and as a narrow pulse form rising non-analytically from zero. Here non-zero temperatures and depolarizing environments are both found to be less destructive in comparison to the ferromagnetic case. The entanglement is found to propagate through the chain in a peculiar fashion whereby it hops to skip alternate sites.

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