Advancements in Quantum Nanoelectronics: Electronic Interferometry with Ultrafast Plasmonic Pulses

Recent advancements in quantum nanoelectronics have been highlighted in a new paper titled "Electronic interferometry with ultrashort plasmonic pulses" by Seddik Ouacel and co-authors. The research explores the potential of electronic flying qubits as an alternative to traditional photonic qubits. The authors argue that electrons, which propagate at slower speeds, can be more easily controlled in real-time, and their Coulomb interactions allow for direct entanglement between different qubits.

The study specifically addresses the challenge of achieving a dynamical regime where the width of the injected plasmonic pulse is shorter than the dimensions of the quantum device. The researchers successfully injected ultrashort single electron plasmonic pulses into a 14-micrometer-long Mach-Zehnder interferometer. Their findings indicate that quantum coherence is maintained for these ultrashort plasmonic pulses, showcasing enhanced contrast of coherent oscillations compared to direct current (DC) regimes. Notably, this coherence persists even under large bias voltages.

This research marks a significant milestone in the field, suggesting that flying qubits could serve as a viable alternative to localized qubit architectures. The implications of this work extend to reduced hardware footprints, increased connectivity, and the potential for scalable quantum information processing. The authors emphasize that these advancements could pave the way for more efficient quantum computing systems, which are crucial for the future of technology in various sectors.

For further details, the paper can be accessed at arXiv:2408.13025.