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Discording Power of Quantum Evolutions by Galve, F.; Plastina, F.; Paris, M. G. A.; Zambrini, R. is a scholarly article available to read on EtoBox.

What is Discording Power of Quantum Evolutions about?

We introduce the discording power of a unitary transformation, which assesses its capability to produce quantum discord, and analyze in detail the generation of discord by relevant classes of two-qubit gates. Our measure is based on the Cartan decomposition of two-qubit unitaries and on evaluating the maximum discord achievable by a unitary upon acting on classical-classical states at fixed purity. We found that there exist gates which are perfect discorders for any value of purity, and that they belong to a class of operators that includes the $\sqrt{{SWAP}}. Other gates, even those universal for quantum computation, do not posses the same property: the CNOT, for example, is a perfect discorder only for states with low or unit purity, but not for intermediate values. The discording power of a two-qubit unitary also provides a generalization of the corresponding measure defined for entanglement to any value of the purity.

Author

Galve, F.; Plastina, F.; Paris, M. G. A.; Zambrini, R.

Published

2012

Language

EN