In-flight distribution of an electron within a surface acoustic wave
| Autor: | Edlbauer, Hermann, Wang, Junliang, Ota, Shunsuke, Richard, Americ, Jadot, Baptiste, Mortemousque, Pierre-André, Okazaki, Yuma, Nakamura, Shuji, Kodera, Tetsuo, Kaneko, Nobu-Hisa, Ludwig, Arne, Wieck, Andreas D., Urdampilleta, Matias, Meunier, Tristan, Bäuerle, Christopher, Takada, Shintaro |
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| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | Appl. Phys. Lett. 119, 114004 (2021) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1063/5.0062491 |
| Popis: | Surface acoustic waves (SAW) have large potential to realize quantum-optics-like experiments with single flying electrons employing their spin or charge degree of freedom. For such quantum applications, highly efficient trapping of the electron in a specific moving quantum dot (QD) of a SAW train plays a key role. Probabilistic transport over multiple moving minima would cause uncertainty in synchronisation that is detrimental for coherence of entangled flying electrons and in-flight quantum operations. It is thus of central importance to identify the device parameters enabling electron transport within a single SAW minimum. A detailed experimental investigation of this aspect is so far missing. Here we fill this gap by demonstrating time-of-flight measurements for a single electron that is transported via a SAW train between distant stationary QDs. Our measurements reveal the in-flight distribution of the electron within the moving acousto-electric quantum dots of the SAW train. Increasing the acousto-electric amplitude, we observe the threshold necessary to confine the flying electron at a specific, deliberately chosen SAW minimum. Investigating the effect of a barrier along the transport channel, we also benchmark the robustness of SAW-driven electron transport against stationary potential variations. Our results pave the way for highly controlled transport of electron qubits in a SAW-driven platform for quantum experiments. Comment: Main paper: 11 pages, 3 figures, Supplementary material: 5 pages, 4 figures |
| Databáze: | arXiv |
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