Long-distance entanglement between two inserted probes in XX chain

Event: 
IICQI 2007
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Abstract: 

In this poster, we study ground state entanglement between two probes at the ends of an isotropic XY chain that coupled by chain by a different coupling constant with respect to the chain. We found that for each length there is a critical coupling constant that before it the concurrence becomes non-vanishing. Also we found that for all lengths of chain can be find a function for concurrence in terms of coupling constant in the scale of critical coupling constant. Also we find the behavior of critical coupling constant for large lengths of chain.

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