Year: 2025
Type: article
Abstract: Coherent manipulation of plasmon wavepackets in solid-state systems is crucial for advancing nanoscale electronic devices, offering a unique platform for quantum information processing based on propagating quantum bits. Controlling the eigenstate of plasmon wavepackets is essential, as it determines their propagation speed and hence the number of quantum operations that can be performed during their flight time through a quantum system. When plasmon wavepackets are generated by short voltage pulses and transmitted through nanoscale devices, they distribute among multiple electron conduction channels via Coulomb interactions, a phenomenon known as charge fractionalisation. This spreading complicates plasmon manipulation in quantum circuits and makes precise control of the eigenstates of plasmon wavepackets challenging. Using a cavity, we demonstrate the ability to isolate and select electron conduction channels contributing to plasmon excitation, thus enabling precise control of plasmon eigenstates. Specifically, we observe an electron-channel blockade effect, where charge fractionalisation into cavity-confined channels is suppressed due to the plasmon's narrow energy distribution, enabling more stable and predictable plasmonic circuits. This technique provides a versatile tool for designing plasmonic circuits, offering the ability to tailor plasmon speed through local parameters, minimise unwanted plasmon excitation in adjacent circuits, and enable the precise selection of electron-channel plasmon eigenstates in quantum interferometers.
Source: Nature Communications
Institutions: National Metrology Institute of Japan, National Institute of Advanced Industrial Science and Technology, The University of Osaka, University of Glasgow, Institut polytechnique de Grenoble, Centre National de la Recherche Scientifique, Institut Néel, Université Grenoble Alpes, The University of Tokyo, Ruhr University Bochum, RIKEN, RIKEN Center for Emergent Matter Science
Language: English
Subfield: Biomedical Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $6,990
Funders: National Institute of Advanced Industrial Science and Technology, Research Councils UK, European Commission, Deutsche Forschungsgemeinschaft, Agence Nationale de la Recherche, Ministry of Education, Culture, Sports, Science and Technology, Bundesministerium für Bildung und Forschung, Centre National de la Recherche Scientifique, Horizon 2020 Framework Programme, Engineering and Physical Sciences Research Council, Japan Society for the Promotion of Science, Japan Science and Technology Agency, Core Research for Evolutional Science and Technology, Moonshot Research and Development Program
Awards: G1145599077, G1190173965, G1884482341, Quantum control of delocalized quantum bits in semiconductors, Grenoble Quantum Engineering Doctoral Programme, Electronic generation and detection in nanoelectronic devices at the picosecond scale, G306436272, Quantum Terahertz Nanoelectronics (QuanTeraN), 半導体非局在量子ビットの量子制御, Electronic Flying Qubits, G385366288, G3899778758, G4385729107, G4656594441, G4937468798, G5045220161, G5081382630, G5741518324, G6226236041, G6234232976, G6278613052, G6718509927, Research on semiconductor quasiparticle wave engineering, Verbundprojekt: QR.X - Quantenrepeater.Link - QR.X -, Teilvorhaben: Molekularstrahlepitaktisches Wachstum von p-i-n-Dioden mit Quantenpunkt-Molekül-Emittern, EXC 2004: Materie und Licht für Quanteninformation (ML4Q), G8394805840, G896859369
OpenAlex ID: W4416199255