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Related Experiment Video

Updated: May 9, 2025

Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities

Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities

Published on: July 24, 2015

Electron collision in a two-path graphene interferometer.

H Chakraborti¹, L Pugliese¹, A Assouline¹

¹SPEC, CEA, CNRS, Université Paris-Saclay, CEA Saclay, Gif sur Yvette Cedex, France.

Science (New York, N.Y.)

|May 1, 2025

Summary

This summary is machine-generated.

Researchers demonstrated the coherent collision of single electrons in a graphene interferometer. This experiment reveals fundamental quantum characteristics of electrons, paving the way for quantum computing applications.

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$Measurements of Long-range Electronic Correlations During Femtosecond Diffraction Experiments Performed on Nanocrystals of Buckminsterfullerene$

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Published on: August 22, 2017

Area of Science:

Quantum physics
Condensed matter physics
Nanotechnology

Background:

Studying electron coherence and indistinguishability is crucial for quantum information processing.
Previous methods required complex setups for generating and synchronizing single electrons.

Purpose of the Study:

To demonstrate the coherent collision of single electrons in a graphene Mach-Zehnder interferometer.
To investigate fundamental properties of colliding electrons using shot noise measurements.

Main Methods:

On-demand generation of single electrons using voltage pulses.
Utilizing a graphene Mach-Zehnder interferometer for electron manipulation.
Measuring shot noise to analyze interference patterns.

Main Results:

Observed fermionic Hong-Ou-Mandel interference, demonstrating electron indistinguishability.
Detected double-winding Aharonov-Bohm interference in noise, highlighting electron distinguishability.
Achieved interference visibilities of approximately 60%, enabling quantum state tomography.

Conclusions:

The study successfully demonstrated coherent electron collisions in graphene.
Complementarity between indistinguishable and distinguishable electron properties was revealed.
Findings suggest potential for coherent operations with flying qubits in graphene systems.