Quantum discord for general two--qubit states: Analytical progress

Details Quantum discord for general two--qubit states: Analytical progress Quantum discord for general two--qubit states: Analytical progress

2011-03-16

arxiv.org/abs/1103.3189v2

Phys. Rev. A 83, 052108 (2011)

Physics

Quantum Physics

8 pages, 2 figures

Scientific paper

10.1103/PhysRevA.83.052108

We present a reliable algorithm to evaluate quantum discord for general two--qubit states, amending and extending an approach recently put forward for the subclass of X--states. A closed expression for the discord of arbitrary states of two qubits cannot be obtained, as the optimization problem for the conditional entropy requires the solution to a pair of transcendental equations in the state parameters. We apply our algorithm to run a numerical comparison between quantum discord and an alternative, computable measure of non-classical correlations, namely the geometric discord. We identify the extremally non-classically correlated two--qubit states according to the (normalized) geometric discord, at fixed value of the conventional quantum discord. The latter cannot exceed the square root of the former for systems of two qubits.

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