  We study entanglement of Kondo clouds in an open triple quantum dots (OTQDs)
system based on the dissipaton equation of motion (DEOM) theory. A
comprehensive picture of the long-range entanglement of Kondo clouds is
sketched by the spectral functions, spin-spin correlation and dot occupancies
of OTQDs. We find that for the configuration (N1,N2,N3) = (1, 0, 1), a
conduction electrons peak occurs in the spectral function of intermediate QD in
Kondo regime. This peak resulting from the overlapping of the two Kondo clouds
forming from between the two peripheral QDs and leads, enhances with decreasing
temperature and increasing dot-lead coupling. Both the spin-spin correlations
between the two adjacent QDs and the two peripheral QDs owns negative values.
It also confirms the physical picuture of the overlapping between left and
right Kondo clouds via the intermediate QD. Moreover, the transition of the
effective electron occupation and the spectral function of intermediate QD in
Kondo regime also indicates the entanglement of Kondo clouds enhancing with
decreasing temperature and increasing dot-lead coupling. This investigation
will be beneficial to detect the Kondo clouds and to further explore Kondo
physics in related experiment setups.
