Assume that one electron has already tunnel through tunnel junction A (lead A - QD) onto the QD. Derive the energy condition for Vs such that a...

Assume that one electron has already tunnel through tunnel junction A (lead A - QD) onto the QD. Derive the energy condition for Vs such that a second electron tunnels onto the QD through junction A. Show that for CA = CB = C, Vs < (q/c)(n+3)

Repeat the above for a third electron tunneling when there are already two electrons on the QD. Show all the derivation steps for both parts.