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Although individual spins in quantum dots have been studied extensively asqubits, their investigation under strong resonant driving in the scope ofaccessing Mollow physics is still an open question. Here, we have grown highquality positively charged quantum dots embedded in a planar microcavity thatenable enhanced light-matter interactions. Under a strong magnetic field in theVoigt configuration, individual positively charged quantum dots provide adouble-lambda level structure. Using a combination of above-band and resonantexcitation, we observe the formation of Mollow triplets on all opticaltransitions. We find that when the strong resonant drive power is used to tunethe Mollow triplet lines through each other, we observe anticrossings. We alsodemonstrate that the interaction that gives rise to the anticrossings can becontrolled in strength by tuning the polarization of the resonant laser drive.Quantum-optical modeling of our system fully captures the experimentallyobserved spectra and provides insight on the complicated level structure thatresults from the strong driving of the double-lambda system.

Observation of Mollow Triplets with Tunable Interactions in Double Lambda Systems of Individual Hole Spins