1. In-flight distribution of an electron within a surface acoustic wave.
- Author
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Edlbauer, Hermann, Wang, Junliang, Ota, Shunsuke, Richard, Aymeric, 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, and Takada, Shintaro
- Subjects
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ACOUSTIC surface waves , *ELECTRON distribution , *DEGREES of freedom , *ELECTRON spin , *ELECTRON transport , *TIME-of-flight measurements - Abstract
Surface acoustic waves (SAWs) 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 synchronization 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. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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