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We demonstrate coherent driving of a single electron spin using secondharmonic excitation in a Si/SiGe quantum dot. Our estimates suggest that theanharmonic dot confining potential combined with a gradient in the transversemagnetic field dominates the second harmonic response. As expected, the Rabifrequency depends quadratically on the driving amplitude and the periodicitywith respect to the phase of the drive is twice that of the fundamentalharmonic. The maximum Rabi frequency observed for the second harmonic is just afactor of two lower than that achieved for the first harmonic when driving atthe same power. Combined with the lower demands on microwave circuitry whenoperating at half the qubit frequency, these observations indicate that secondharmonic driving can be a useful technique for future quantum computationarchitectures.

Second Harmonic Coherent Driving of a Spin Qubit in a Si/SiGe Quantum Dot