Satyabrata Adhikari, Subhashish Banerjee. An Operational Meaning of Discord in terms of Teleportation Fidelity


Natural Sciences / Physics / Quantum field theory

Submitted on: Oct 06, 2012, 07:59:31

Description: Quantum discord is a prominent measure of quantum correlations, playing an important role in expanding its horizon beyond entanglement. Here we provide an operational meaning of (geometric) discord, which quantifies the amount of non-classical correlation of an arbitrary quantum system in terms of its minimal distance from the set of classical states, in terms of teleportation fidelity for general two qubit and $d otimes d$ dimensional isotropic and Werner states. A critical value of the discord is found beyond which the two qubit state must violate the Bell inequality. This is illustrated by an open system model of a dissipative two qubit. For the $d otimes d$ dimensional states the lower bound of discord is shown to be obtainable from an experimentally measurable witness operator.

The abstract of this article will be published in the October 2012 issue of "Intellectual Archive Bulletin", ISSN 1929-1329.

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