  As a fundamental building block for quantum computation and communication
protocols, the correct verification of the two-photon interference (TPI)
contrast between two independent quantum light sources is of utmost importance.
Here, we experimentally demonstrate how frequently present blinking dynamics
and changes in emitter brightness critically affect the Hong-Ou-Mandel-type
(HOM) correlation histograms of remote TPI experiments measured via the
commonly utilized setup configuration. We further exploit this qualitative and
quantitative explanation of the observed correlation dynamics to establish an
alternative interferometer configuration, which is overcoming the discussed
temporal fluctuations, giving rise to an error-free determination of the remote
TPI visibility. We prove full knowledge of the obtained correlation by
reproducing the measured correlation statistics via Monte-Carlo simulations. As
exemplary system, we make use of two pairs of remote semiconductor quantum
dots, however, the same conclusions apply for TPI experiments with flying
qubits from any kind of remote solid state quantum emitters.
