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Electronic interferometry with ultrashort plasmonic pulses.

Seddik Ouacel1, Lucas Mazzella1, Thomas Kloss1

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Researchers demonstrate on-demand injection of ultrashort single-electron plasmonic pulses into quantum devices. This breakthrough shows robust quantum coherence and potential for scalable quantum information processing using flying qubits.

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Area of Science:

  • Quantum Computing
  • Nanoelectronics
  • Quantum Information Science

Background:

  • Flying electrons offer advantages over photonic qubits for quantum information processing due to slower propagation and Coulomb interaction for entanglement.
  • Achieving competitive coherent operations with flying electrons requires on-demand injection of single-electron wavepackets shorter than device dimensions.

Purpose of the Study:

  • To demonstrate the on-demand injection of ultrashort single-electron plasmonic pulses into a quantum nanoelectronic system.
  • To investigate the robustness of quantum coherence under these injection conditions.
  • To explore the high-frequency dynamics and potential of flying qubits.

Main Methods:

  • Injection of ultrashort single-electron plasmonic pulses into a 14-micrometer Mach-Zehnder interferometer.
  • Observation of coherent oscillations in the single-electron regime to confirm quantum coherence.
  • Analysis of system dynamics to identify operational regimes at high frequencies.

Main Results:

  • Successful on-demand injection of ultrashort single-electron plasmonic pulses.
  • Demonstration of robust quantum coherence, evidenced by coherent oscillations.
  • Identification of a prominent "non-adiabatic" regime at high frequencies.

Conclusions:

  • On-demand injection of ultrashort plasmonic pulses preserves quantum coherence, making flying electrons viable for quantum information processing.
  • Flying qubits present a promising alternative to localized qubit architectures, offering scalability and reduced hardware footprint.
  • The observed non-adiabatic regime at high frequencies opens new avenues for quantum control and computation.