Electronic interferometry with ultrashort plasmonic pulses

• URL: http://arxiv.org/abs/2408.13025v1
• Date: Fri, 23 Aug 2024 12:29:02 GMT
• Title: Electronic interferometry with ultrashort plasmonic pulses
• Authors: Seddik Ouacel, Lucas Mazzella, Thomas Kloss, Matteo Aluffi, Thomas Vasselon, Hermann Edlbauer, Junliang Wang, Clement Geffroy, Jashwanth Shaju, Michihisa Yamamoto, David Pomaranski, Shintaro Takada, Nobu-Hisa Kaneko, Giorgos Georgiou, Xavier Waintal, Matias Urdampilleta, Arne Ludwig, Andreas D. Wieck, Hermann Sellier, Christopher Bäuerle,
• Abstract summary: We show that quantum coherence is preserved for ultrashort plasmonic pulses, exhibiting enhanced contrast of coherent oscillations compared to the DC regime. This milestone demonstrates the feasibility of flying qubits as a promising alternative to localized qubit architectures.
• Score: 0.8141910845471796
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Electronic flying qubits offer an interesting alternative to photonic qubits: electrons propagate slower, hence easier to control in real time, and Coulomb interaction enables direct entanglement between different qubits. While their coherence time is limited, picosecond-scale control would make them competitive in terms of number of possible coherent operations. The key challenge lies in achieving the dynamical regime, where the injected plasmonic pulse width is shorter than the quantum device dimensions. Here we reach this new regime in a quantum nanoelectronic system by injecting ultrashort single electron plasmonic pulses into a 14-micrometer-long Mach-Zehnder interferometer. Our findings reveal that quantum coherence is preserved for ultrashort plasmonic pulses, exhibiting enhanced contrast of coherent oscillations compared to the DC regime. Moreover, this coherence remains robust even under large bias voltages. This milestone demonstrates the feasibility of flying qubits as a promising alternative to localized qubit architectures, offering reduced hardware footprint, increased connectivity, and potential for scalable quantum information processing.

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