Entanglement, discord and the power of quantum computation

Details Entanglement, discord and the power of quantum computation Entanglement, discord and the power of quantum computation

2010-09-14

arxiv.org/abs/1009.2571v2

Phys. Rev. A 83, 010301 (2011)

Physics

Quantum Physics

Published version. More results are added

Scientific paper

10.1103/PhysRevA.83.010301

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 bi-locally 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.

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