Physics – Quantum Physics
Scientific paper
2010-12-07
J. Phys.: Conf. Ser. 306 012030 (2011)
Physics
Quantum Physics
Prepared for publication in the Proceedings of DICE2010. Section 4 contains previously unpublished results on process tomograp
Scientific paper
10.1088/1742-6596/306/1/012030
Quantum discord is a measure of the quantumness of correlations. After reviewing its different versions and properties, we apply it to the questions of quantum information processing. First we show that changes in discord in the processed unentangled states indicate the need for entanglement in the distributed implementation of quantum gates. On the other hand, it was shown that zero system-environment discord is a necessary and sufficient condition for applicability of the standard completely positive description of the system's evolution. We demonstrate that this result does not translate into useful quantum process tomography. Depending on the details of the preparation procedure only absence of any initial correlations may guarantees consistency of the process tomography.
Brodutch Aharon
Gilchrist Alexei
Terno Daniel R.
Wood Christopher J.
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