Long hold times in a two-junction electron trap

A. Kemppinen, S.V. Lotkhov, O.-P. Saira, A.B. Zorin, J.P. Pekola, A. J. Manninen

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Abstract

The hold time τ of a single-electron trap is shown to increase significantly due to suppression of photon assisted tunneling events. Using two rf-tight radiation shields instead of a single one, we demonstrate increase of τ by a factor exceeding 103, up to about 10 h, for a trap with only two superconductor (S)—normal-metal (N) tunnel junctions and an on-chip resistor R ∼ 100 kΩ (R-SNS structure). In the normal state, the improved shielding made it possible to observe τ ∼ 100 s, which is in reasonable agreement with the quantum-leakage-limited level expected for the two-electron cotunneling process.
Original languageEnglish
Article number142106
Pages (from-to)1-3
Number of pages3
JournalApplied Physics Letters
Volume99
Issue number14
DOIs
Publication statusPublished - 2011
MoE publication typeA1 Journal article-refereed

Keywords

  • single-electron trap
  • two-junction

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    Kemppinen, A., Lotkhov, S. V., Saira, O-P., Zorin, A. B., Pekola, J. P., & Manninen, A. J. (2011). Long hold times in a two-junction electron trap. Applied Physics Letters, 99(14), 1-3. [142106]. https://doi.org/10.1063/1.3647557