  We report experiments on the interference through spin states of electrons in
a quantum dot (QD) embedded in an Aharonov-Bohm (AB) interferometer. We have
picked up a spin-pair state, for which the environmental conditions are ideally
similar and have traced the AB amplitude in the range of the gate voltage that
covers the pair. The behavior of the asymmetry in the amplitude around the two
Coulomb peaks agrees with the theoretical prediction that relates a spin-flip
process in a QD to the quantum dephasing of electrons. These results consist
evidence of "partial coherence" due to an entanglement of spins in the QD and
the interferometer.
