  Building on an earlier proposal for the production of polarization-entangled
microwaves by means of intraband transitions in a pair of quantum dots, we show
how this device can be used to transfer an unknown single-qubit state from
electronic charge to photonic polarization degrees of freedom. No postselection
is required, meaning that the quantum state transfer happens deterministically.
Decoherence of the charge qubit causes a non-monotonic decay of the fidelity of
the transferred state with increasing decoherence rate.
