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We have studied interactions between two capacitively coupled GaAs/AlGaAsfew-electron double quantum dots. Each double quantum dot defines a tunabletwo-level system, or qubit, in which a single excess electron occupies eitherthe ground state of one dot or the other. Applying microwave radiation weresonantly drive transitions between states and non-invasively measureoccupancy changes using proximal quantum point contact charge detectors. Thelevel structure of the interacting two-qubit system is probed by driving it ata fixed microwave frequency whilst varying the energy detuning of both doubledots. We observe additional resonant transitions consistent with a simplecoupled two-qubit Hamiltonian model.

Microwave-Driven Transitions in Two Coupled Semiconductor Charge Qubits