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On-demand single-electron transfer between distant quantum dots

Abstract

Single-electron circuits of the future, consisting of a network of quantum dots, will require a mechanism to transport electrons from one functional part of the circuit to another. For example, in a quantum computer1 decoherence and circuit complexity can be reduced by separating quantum bit (qubit) manipulation from measurement and by providing a means of transporting electrons between the corresponding parts of the circuit2. Highly controlled tunnelling between neighbouring dots has been demonstrated3,4, and our ability to manipulate electrons in single- and double-dot systems is improving rapidly5,6,7,8. For distances greater than a few hundred nanometres, neither free propagation nor tunnelling is viable while maintaining confinement of single electrons. Here we show how a single electron may be captured in a surface acoustic wave minimum and transferred from one quantum dot to a second, unoccupied, dot along a long, empty channel. The transfer direction may be reversed and the same electron moved back and forth more than sixty times—a cumulative distance of 0.25 mm—without error. Such on-chip transfer extends communication between quantum dots to a range that may allow the integration of discrete quantum information processing components and devices.

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Figure 1: Device, initialization and single-electron transfer.
Figure 2: Single-electron transfer reliability.
Figure 3: Dependence of LQD depopulation on SAW power and pulse width.
Figure 4: Backscattering of electrons in the RQD due to SAW(L).

References

  1. Loss, D. & DiVincenzo, D. P. Quantum computation with quantum dots. Phys. Rev. A 57, 120–126 (1998)

    Article  ADS  CAS  Google Scholar 

  2. Barnes, C. H. W., Shilton, J. M. & Robinson, A. M. Quantum computation using electrons trapped by surface acoustic waves. Phys. Rev. B 62, 8410–8419 (2000)

    Article  ADS  CAS  Google Scholar 

  3. Petta, J. R. et al. Coherent manipulation of coupled electron spins in semiconductor quantum dots. Science 309, 2180–2184 (2005)

    Article  ADS  CAS  Google Scholar 

  4. Pioro-Ladrière, M. et al. Electrically driven single-electron spin resonance in a slanting Zeeman field. Nature Phys. 4, 776–779 (2008)

    Article  ADS  Google Scholar 

  5. Elzerman, J. M. et al. Single-shot read-out of an individual electron spin in a quantum dot. Nature 430, 431–435 (2004)

    Article  ADS  CAS  Google Scholar 

  6. Hanson, R. et al. Single-shot readout of electron spin states in a quantum dot using spin-dependent tunnel rates. Phys. Rev. Lett. 94, 196802 (2005)

    Article  ADS  CAS  Google Scholar 

  7. Morello, A. et al. Single-shot readout of an electron spin in silicon. Nature 467, 687–691 (2010)

    Article  ADS  CAS  Google Scholar 

  8. Hanson, R., Kouwenhoven, L. P., Petta, J. R., Tarucha, S. & Vandersypen, L. M. K. Spins in few-electron quantum dots. Rev. Mod. Phys. 79, 1217–1265 (2007)

    Article  ADS  CAS  Google Scholar 

  9. Field, M. et al. Measurements of Coulomb blockade with a noninvasive voltage probe. Phys. Rev. Lett. 70, 1311–1314 (1993)

    Article  ADS  CAS  Google Scholar 

  10. Kataoka, M., Barnes, C. H. W., Beere, H. E., Ritchie, D. A. & Pepper, M. Experimental investigation of the surface acoustic wave electron capture mechanism. Phys. Rev. B 74, 085302 (2006)

    Article  ADS  Google Scholar 

  11. Rahman, S., Kataoka, M., Barnes, C. H. W. & Langtangen, H. P. Numerical investigation of a piezoelectric surface acoustic wave interaction with a one-dimensional channel. Phys. Rev. B 74, 035308 (2006)

    Article  ADS  Google Scholar 

  12. Kataoka, M. et al. Single-electron population and depopulation of an isolated quantum dot using a surface-acoustic-wave pulse. Phys. Rev. Lett. 98, 046801 (2007)

    Article  ADS  CAS  Google Scholar 

  13. Taubert, D. et al. Relaxation of hot electrons in a degenerate two-dimensional electron system: transition to one-dimensional scattering. Phys. Rev. B 83, 235404 (2011)

    Article  ADS  Google Scholar 

  14. Fujisawa, T. et al. Spontaneous emission spectrum in double quantum dot devices. Science 282, 932–935 (1998)

    Article  ADS  CAS  Google Scholar 

  15. Gell, J. R. et al. Surface-acoustic-wave-driven luminescence from a lateral p–n junction. Appl. Phys. Lett. 89, 243505 (2006)

    Article  ADS  Google Scholar 

  16. Stotz, J. A. H., Hey, R., Santos, P. V. & Ploog, K. H. Coherent spin transport through dynamic quantum dots. Nature Mater. 4, 585–588 (2005)

    Article  ADS  CAS  Google Scholar 

  17. Kataoka, M. et al. Coherent time evolution of a single-electron wave function. Phys. Rev. Lett. 102, 156801 (2009)

    Article  ADS  CAS  Google Scholar 

  18. Morgan, D. Surface Acoustic Wave Design 9–18 (Academic, 2007)

    Google Scholar 

Download references

Acknowledgements

The authors acknowledge funding from the UK EPSRC, Toshiba Research Europe Limited and QIPIRC.

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Contributions

R.P.G.M., M.K., C.J.B.F. and C.H.W.B. designed the experiment; I.F. and D.A.R. provided wafers; D.A. and G.A.C.J. performed electron-beam lithography; R.P.G.M. processed samples and analysed data; R.P.G.M. and M.K. performed experiments; R.P.G.M., C.J.B.F. and M.K. wrote the paper.

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Correspondence to C. J. B. Ford.

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The authors declare no competing financial interests.

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McNeil, R., Kataoka, M., Ford, C. et al. On-demand single-electron transfer between distant quantum dots. Nature 477, 439–442 (2011). https://doi.org/10.1038/nature10444

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