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• W3100404601 abstract "An advanced understanding of ultrafast coherent electron dynamics is necessary for the application of submicrometre devices under a non-equilibrium drive to quantum technology, including on-demand single-electron sources1, electron quantum optics2–4, qubit control5–7, quantum sensing8,9 and quantum metrology10. Although electron dynamics along an extended channel has been studied extensively2–4,11, it is hard to capture the electron motion inside submicrometre devices. The frequency of the internal, coherent dynamics is typically higher than 100 GHz, beyond the state-of-the-art experimental bandwidth of less than 10 GHz (refs. 6,12,13). Although the dynamics can be detected by means of a surface-acoustic-wave quantum dot14, this method does not allow for a time-resolved detection. Here we theoretically and experimentally demonstrate how we can observe the internal dynamics in a silicon single-electron source that comprises a dynamic quantum dot in an effective time-resolved fashion with picosecond resolution using a resonant level as a detector. The experimental observations and the simulations with realistic parameters show that a non-adiabatically excited electron wave packet15 spatially oscillates quantum coherently at ~250 GHz inside the source at 4.2 K. The developed technique may, in future, enable the detection of fast dynamics in cavities, the control of non-adiabatic excitations15 or a single-electron source that emits engineered wave packets16. With such achievements, high-fidelity initialization of flying qubits5, high-resolution and high-speed electromagnetic-field sensing8 and high-accuracy current sources17 may become possible. The internal electron dynamics of submicrometre devices are hard to resolve because of bandwidth limitations of current measurement techniques. Here, the authors sample the 250 GHz coherent oscillation of a single-electron wave packet inside a quantum dot at 4.2 K employing a resonant level." @default.
• W3100404601 created "2020-11-23" @default.
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• W3100404601 date "2019-11-01" @default.
• W3100404601 modified "2023-10-14" @default.
• W3100404601 title "Picosecond coherent electron motion in a silicon single-electron source" @default.
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• W3100404601 doi "https://doi.org/10.1038/s41565-019-0563-2" @default.
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