Comment on “Groverian entanglement measure and evolution of entanglement in search algorithm for n(= 3, 5)-qubit systems with real coefficients” (volume 6, number 4, August 2007), by Arti Chamoli and C. M. Bhandari

摘要

We point out that the main results—the analytic expressions for the Groverian measure of entanglement, in the above mentioned paper are erroneous. The technical mistake of the paper is discussed. It is shown by an explicit example that the formula for calculating the Groverian measure yields ${G(|psirangle)=0}$ for some entangled states.