In quantum information and communication one looks for the non-classical
features like interference and quantum correlations to harness the true power
of composite systems. We show how the concept akin to interference is, in fact,
intertwined in a quantitative manner to entanglement and quantum correlation.
In particular, we prove that the difference in the squared visibility for a
density operator before and after a complete measurement, averaged over all
unitary evolutions, is directly related to the quantum correlation measure
based on the measurement disturbance. For pure and mixed bipartite states the
unitary average of the squared visibility is related to entanglement measure.
This may constitute direct detection of entanglement and quantum correlations
with quantum interference setups. Furthermore, we prove that for a fixed purity
of the subsystem state, there is a complementarity relation between the linear
entanglement of formation and the measurement disturbance. This brings out a
quantitative difference between two kinds of quantum correlations.Comment: 6 pages, Revtex4-1, no figure. Any comments or remarks are welcome
