Long hold times in a two-junction electron trap

Antti Kemppinen (Corresponding Author), S.V. Lotkhov, O.-P. Saira, A.B. Zorin, J.P. Pekola, Antti J. Manninen

    Research output: Contribution to journalArticleScientificpeer-review

    17 Citations (Scopus)


    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
    Number of pages3
    JournalApplied Physics Letters
    Issue number14
    Publication statusPublished - 2011
    MoE publication typeA1 Journal article-refereed


    • electrometers
    • tunneling
    • electroluminescence
    • photoacoustic imaging
    • resistors


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