Phonon-mediated generation of quantum correlations between quantum dot qubits

摘要

We study the generation of quantum correlations between two excitonic quantumdot qubits due to their interaction with the same phonon environment. Suchgeneration results from the fact that during the pure dephasing process atfinite temperatures, each exciton becomes entangled with the phononenvironment. We find that for a wide range of temperatures quantum correlationsare created due to the interaction. The temperature-dependence of the amount ofcorrelations created displays a trade-off type behaviour; for smalltemperatures the phonon-induced distrubance of the qubit states is too small tolead to a distinct change of the two-qubit state, hence, the amount of createdcorrelations is small, while for large temperatures the pure dephasing is notaccompanied by the creation of entanglement between the qubits and theenvironment, so the environment cannot mediate qubit-qubit quantumcorrelations.