Entropy, fidelity, and double orthogonality for resonance states in two-electron quantum dots

摘要

Resonance states of a two-electron quantum dot are studied using avariational expansion with both real basis-set functions and complex scalingmethods. The two-electron entanglement (linear entropy) is calculated as afunction of the electron repulsion at both sides of the critical value, wherethe ground (bound) state becomes a resonance (unbound) state. The linearentropy and fidelity and double orthogonality functions are compared as methodsfor the determination of the real part of the energy of a resonance. Thecomplex linear entropy of a resonance state is introduced using complex scalingformalism.