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Updated: May 9, 2025

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.
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.
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.
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