1201.5620 (Shaon Sahoo)

On Measure of Entanglement Between Two Distant Parts of a Many-body
System in Pure State    [PDF]

Shaon Sahoo

Here we derive the condition for an entanglement measure between two parts of
a many-body system to be optimum. We then introduce concept of a
basis-independent and unique measure by extending notion of entanglement
entropy for a single-step measurement to a multi-step measurement. The
extension is done from the perspective of information theory; the entanglement
measure one gets from this extension can easily be calculated without any need
for an optimization process. We also discuss the important cases when this
measure satisfies the condition to be an optimum. In the last part of the paper
some numerical results are presented to show how the measure of entanglement
varies with distance between two parts and also with the parameters of a model.

View original: http://arxiv.org/abs/1201.5620