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Open Quantum Systems Decoherence

Coupling-energy driven pumping through quantum dots: the role of coherences

arXiv
Authors: Lukas Litzba, Gernot Schaller, Jürgen König, Nikodem Szpak

Year

2026

Paper ID

15593

Status

Preprint

Abstract Read

~2 min

Abstract Words

103

Citations

N/A

Abstract

We study the impact of off-resonant tunneling and coherences on the electron pumping through quantum dots. Thereby, we focus on two electron-pump setups where lowest-order tunneling processes are suppressed and the pump is exclusively driven by modulations of the coupling energy. The first setup is driven by switching on and off the couplings between the quantum dot and the leads, while the second setup employs measurements of the dot occupation. We derive exact solutions for arbitrarily strong tunnel couplings in the absence of Coulomb interaction, identify parameter regimes with optimal pumping currents or optimal energy efficiency, and discuss similarities between both pumping mechanisms.

Why This Paper Matters

  • This paper contributes to the Open Quantum Systems & Decoherence research area in the Quantum Articles archive.
  • It adds a 2026 reference point for readers tracking recent quantum research.
  • We study the impact of off-resonant tunneling and coherences on the electron pumping through quantum dots.

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References & Citation Signals

[1] DOI https://doi.org/arXiv:2602.23099 [2] arXiv https://arxiv.org/abs/2602.23099 [3] Publisher https://arxiv.org/abs/2602.23099

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