Single-electron entanglement and nonlocality

Research output: Contribution to journalArticle


Motivated by recent progress in electron quantum optics, we revisit the question of single-electron entanglement, specifically whether the state of a single electron in a superposition of two separate spatial modes should be considered entangled. We first discuss a gedanken experiment with single-electron sources and detectors, and demonstrate deterministic (i. e. without post-selection) Bell inequality violation. This implies that the single-electron state is indeed entangled and, furthermore, nonlocal. We then present an experimental scheme where single-electron entanglement can be observed via measurements of the average currents and zero-frequency current cross-correlators in an electronic Hanbury Brown-Twiss interferometer driven by Lorentzian voltage pulses. We show that single-electron entanglement is detectable under realistic operating conditions. Our work settles the question of single-electron entanglement and opens promising perspectives for future experiments.


  • David Dasenbrook
  • Joseph Bowles
  • Jonatan Bohr Brask
  • Patrick P. Hofer
  • Christian Flindt
  • Nicolas Brunner
External organisations
  • University of Geneva
  • Helsinki University of Technology
Research areas and keywords


  • electronic interferometer, entanglement, nonlocality, quantum transport, single-electron source
Original languageEnglish
Article number043036
JournalNew Journal of Physics
Issue number4
Publication statusPublished - 2016 Apr 1
Publication categoryResearch
Externally publishedYes