Abstract
We derive a general scattering-matrix formula for the pumped current through a coherent mesoscopic region attached to a normal and a superconducting lead. As an application of this result we calculate the current pumped through a quantum dot coupled to a superconducting lead. Andreev reflection is shown to enhance the pumped current by up to a factor of 4 in case of equal coupling to the leads. We find that this enhancement can still be further increased for slightly asymmetric coupling and show that the pumping cycle is completed well before decoherence sets in. Adiabatic pumping of electrons can thus in principle be used to coherently transfer quantum information across a quantum dot structure.
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© 2005 Springer
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Blaauboer, M. (2005). Coherent Transport by Adiabatic Pumping. In: Akulin, V., Sarfati, A., Kurizki, G., Pellegrin, S. (eds) Decoherence, Entanglement and Information Protection in Complex Quantum Systems. NATO Science Series II: Mathematics, Physics and Chemistry, vol 189. Springer, Dordrecht. https://doi.org/10.1007/1-4020-3283-8_43
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DOI: https://doi.org/10.1007/1-4020-3283-8_43
Publisher Name: Springer, Dordrecht
Print ISBN: 978-1-4020-3281-3
Online ISBN: 978-1-4020-3283-7
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