Geometric discord for a driven two-qubit system
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MIHAESCU, Tatiana; CECOI, Elena; MACOVEI, Mihai; ISAR, Aurelian. Geometric discord for a driven two-qubit system. In: Romanian Reports in Physics. 2021, nr. 1(73), pp. 1-16. ISSN 1221-1451.
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Romanian Reports in Physics
Numărul 1(73) / 2021 / ISSN 1221-1451

Geometric discord for a driven two-qubit system

Pag. 1-16

Mihaescu Tatiana12, Cecoi Elena3, Macovei Mihai3, Isar Aurelian12
1 Horia Hulubei National Institute of Physics and Nuclear Engineering,
2 University of Bucharest,
3 Institute of Applied Physics
Disponibil în IBN: 8 aprilie 2021


We employ a rescaled version of the geometric measure of quantum discord, based on the Hilbert-Schmidt norm, to calculate it in the steady-state for a concrete system formed of a closely packed and laser-pumped pair of identical two-level qubits being initially uncorrelated and located in their ground states, respectively. Furthermore, the qubits are longitudinally coupled with a single-mode boson field, while both subsystems are damped via their corresponding environmental reservoirs. Although the employed metric is still noncontractive under quantum operations, it was shown previously in a series of physical examples that this measure of quantum correlations is in agreement with other discord measures. 

Geometric quantum discord