Entanglement, discord, and the power of quantum computation

Aharon Brodutch*, Daniel R. Terno

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

63 Citations (Scopus)
6 Downloads (Pure)


We show that the ability to create entanglement is necessary for execution of bipartite quantum gates even when they are applied to unentangled states and create no entanglement. Starting with a simple example we demonstrate that to execute such a gate bilocally the local operations and classical communications (LOCC) should be supplemented by shared entanglement. Our results point to the changes in quantum discord, which is a measure of quantumness of correlations even in the absence of entanglement, as the indicator of failure of a LOCC implementation of the gates.

Original languageEnglish
Article number010301
Pages (from-to)1-4
Number of pages4
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Issue number1
Publication statusPublished - 7 Jan 2011

Bibliographical note

Brodutch A and Terno DR. Physical review A. Atomic, molecular, and optical physics, 83(1),010301(R), 2011. Copyright (2011) by the American Physical Society. The original article can be found at http://dx.doi.org/10.1103/PhysRevA.83.010301.


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