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We investigate spin states of few electrons in a double quantum dot bycoupling them weakly to a magnetic field resilient NbTiN microwave resonator.We observe a reduced resonator transmission if resonator photons and spinsinglet states interact. This response vanishes in a magnetic field once thequantum dot ground state changes from a spin singlet into a spin triplet state.Based on this observation, we map the two-electron singlet-triplet crossover byresonant spectroscopy. By measuring the resonator only, we observe Pauli spinblockade known from transport experiments at finite source-drain bias anddetect an unconventional spin blockade triggered by the absorption of resonatorphotons.

Microwave cavity detected spin blockade in a few electron double quantum dot