Print Email Facebook Twitter Second-Harmonic Coherent Driving of a Spin Qubit in a Si/SiGe Quantum Dot Title Second-Harmonic Coherent Driving of a Spin Qubit in a Si/SiGe Quantum Dot Author Scarlino, P. Kawakami, E. Ward, D.R. Savage, D.E. Lagally, M.G. Friesen, M. Coppersmith, S.N. Eriksson, M.A. Vandersypen, L.M.K. Faculty Applied Sciences Department QN/Quantum Nanoscience Date 2015-09-01 Abstract We demonstrate coherent driving of a single electron spin using second-harmonic excitation in a Si/SiGe quantum dot. Our estimates suggest that the anharmonic dot confining potential combined with a gradient in the transverse magnetic field dominates the second-harmonic response. As expected, the Rabi frequency depends quadratically on the driving amplitude, and the periodicity with respect to the phase of the drive is twice that of the fundamental harmonic. The maximum Rabi frequency observed for the second harmonic is just a factor of 2 lower than that achieved for the first harmonic when driving at the same power. Combined with the lower demands on microwave circuitry when operating at half the qubit frequency, these observations indicate that second-harmonic driving can be a useful technique for future quantum computation architectures. To reference this document use: http://resolver.tudelft.nl/uuid:970f280a-894f-4551-a645-1a63e75cbaed Publisher American Physical Society ISSN 0031-9007 Source https://doi.org/10.1103/PhysRevLett.115.106802 Source Physical Review Letters, 115 (10), 2015 Part of collection Institutional Repository Document type journal article Rights © 2015 American Physical Society Files PDF 320830.pdf 757.82 KB Close viewer /islandora/object/uuid:970f280a-894f-4551-a645-1a63e75cbaed/datastream/OBJ/view