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

Authors:
Preeti Parashar;Swapan Rana
Affiliations:
Physics and Applied Mathematics Unit, Indian Statistical Institute, Kolkata, India 700 108;Physics and Applied Mathematics Unit, Indian Statistical Institute, Kolkata, India 700 108
Venue:
Quantum Information Processing
Year:
2009

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Groverian Entanglement Measure and Evolution of Entanglement in Search Algorithm for n(= 3, 5)-Qubit Systems with Real Coefficients

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Abstract

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 $${G(|\psi\rangle)=0}$$ for some entangled states.