Silicon/silicon-germanium heterostructures allow the fabrication of gated quantum dots in modulation doped heterostructures.
The image at left shows an SEM micrograph of a Si/SiGe quantum dot with an integrated charge sensor that can be used to verify single-electron occupation of the dot.
Selected publications on this topic:
“State-conditional coherent charge qubit oscillations in a Si/SiGe quadruple quantum dot.” D. R. Ward, Dohun Kim, D. E. Savage, M. G. Lagally, R. H. Foote, Mark Friesen, S. N. Coppersmith, and M. A. Eriksson, npj Quant. Inf. 2, 16032 (2016). [Journal Article | arXiv]
“Electrode-stress-induced nanoscale disorder in Si quantum electronic devices.” J. Park, Y. Ahn, J. A. Tilka, K. C. Sampson, D. E. Savage, J. R. Prance, C. B. Simmons, M. G. Lagally, S. N. Coppersmith, M. A. Eriksson, M. V. Holt, and Paul G. Evans, APL Materials 4, 066102 (2016). [Journal Article]
“High-fidelity resonant gating of a silicon-based quantum dot hybrid qubit.” Dohun Kim, D. R. Ward, C. B. Simmons, D. E. Savage, M. G. Lagally, Mark Friesen, S. N. Coppersmith, and M. A. Eriksson, npj Quant. Inf. 1, 15004 (2015). [Journal Article | arXiv]
“Transport through an impurity tunnel coupled to a Si/SiGe quantum dot.” R. H. Foote, D. R. Ward, J. R. Prance, John King Gamble, E. Nielsen, B. Thorgrimsson, D. E. Savage, A. L. Saraiva, Mark Friesen, S. N. Coppersmith, and M. A. Eriksson, Appl. Phys. Lett. 107, 103112 (2015). [Journal Article | arXiv]
“Microwave-driven coherent operations of a semiconductor quantum dot charge qubit.” Dohun Kim, D. R. Ward, C. B. Simmons, John King Gamble, R. Blume-Kohout, E. Nielsen, D. E. Savage, M. G. Lagally, Mark Friesen, S. N. Coppersmith, and M. A. Eriksson, Nature Nanotech. 10, 243 (2015). [Journal Article | arXiv]
“Two-axis control of a singlet-triplet qubit with an integrated micromagnet.” X. Wu, D. R. Ward, J. R. Prance, Dohun Kim, John King Gamble, R. T. Mohr, Zhan Shi, D. E. Savage, M. G. Lagally, Mark Friesen, S. N. Coppersmith, and M. A. Eriksson, Proc. Natl. Acad. Sci. 111, 11938 (2014). [Journal Article | arXiv]
“Quantum control and process tomography of a semiconductor quantum dot hybrid qubit.” Dohun Kim, Zhan Shi, C. B. Simmons, D. R. Ward, J. R. Prance, Teck Seng Koh, John King Gamble, D. E. Savage, M. G. Lagally, Mark Friesen, S. N. Coppersmith, and M. A. Eriksson, Nature 511, 70 (2014). [Journal Article | arXiv]
“Fast coherent manipulation of three-electron states in a double quantum dot.” Zhan Shi, C. B. Simmons, D. R. Ward, J. R. Prance, X. Wu, Teck Seng Koh, John King Gamble, D. E. Savage, M. G. Lagally, Mark Friesen, S. N. Coppersmith, and M. A. Eriksson, Nature Comm. 5, 3020 (2014). [Journal Article | arXiv]
“Semiconductor Quantum Dot Qubits.” M. A. Eriksson, S. N. Coppersmith, and M. G. Lagally, MRS Bulletin 38, 794 (2013). [Journal Article]