Great exchange of ideas: SEQUOIA workshop fostered exchange and uptake of electron quantum optics techniques for metrology

On 11/12th October we had a great online workshop with more than a hundred registered participants from worldwide institutions of whom about 80 were online at any time. Great talks both from external speakers and from SEQUOIA partners sparked lively discussions. This was a great step to form a worldwide community in this developing field, interested in metrology with and for single-electron wave packets.


Single-Electron Optics for Metrology WorkShop on Oct 11/12

We are happy to announce that we will have a very exciting Workshop on Single-Electron Optics for Metrology with free online participation for everybody interested. Besides presentations of key results of our SEQUOIA project by our team, we will have also have a number of exciting talks by the following invited speakers:

  • Akira Fujiwara (NTT BRL, Japan)
  • Christian Glattli (CEA, France)
  • Christopher Bauerle (Institut Néel, France)
  • Janine Splettstoesser (Chalmers, Sweden)
  • Masayuki Hashisaka (NTT, Japan)
  • Michael Moskalets (DMSP, NTU “KhPI”, Ukraine)
  • Michihisa Yamamoto (RIKKEN, Japan)
  • Myung-Ho Bae (KRISS, South Korea)
  • Pascal Degiovanni (ENS-Lyon, France)

Program for download 

Registration link

Introductory Video to the SEQUOIA Project

Publication on tomography of solitary electrons in Nature Communications

In a fruitful project collaboration among our two partners NPL and University of Latvia and with contributions from the Freie Universität Berlin a new tomography method for solitary electrons has been developed and demonstrated. This allows to map the state of a solitary electron, that is injected by a single electron source into a ballistic conductor. The method also measures the 'quantumness' of a state, i.e. how near to the Heisenberg uncertainty limit we are. This breakthrough yields an important building block for a metrology using the quantum state of single electrons. The paper was published in the highly reputed journal Nature Communications.

J. D. Fletcher, N. Johnson, E. Locane, P. See, J. P. Griffiths, I. Farrer, D. A. Ritchie, P. W. Brouwer, V. Kashcheyevs and M. Kataoka
Continuous-variable tomography of solitary electrons
Nature Communications 10, 5298 (2019).

Midterm meeting and workshop with stakeholders

On October 16th/17th we had a very successful workshop and project meeting with large participation of scientists from our stakeholder institutions. We thank them for their great contributions to the success of this meeting!

Publication on Quantum Tomography in Nature Communications

Researchers arround our project partner Gwendal Feve (CNRS) have published a paper on "Quantum tomography of electrical currents" in the highly reputed journal Nature Communications. They demonstrate a quantum tomography protocol, which extracts electron and hole wavefunctions generated by nanoelectric sources and their emission probabilities from any electrical current. They extract the wavefunctions generated by trains of Lorentzian pulses carrying one or two electrons. This work offers perspectives for quantum information processing with electrical currents and for investigating basic quantum physics in many-body systems.

R. Bisognin, A. Marguerite, B. Roussel, M. Kumar, C. Cabart, C. Chapdelaine, A. Mohammad-Djafari, J.-M. Berroir, E. Bocquillon, B. Plaçais, A. Cavanna, U. Gennser, Y. Jin, P. Degiovanni and G. Fève
Quantum tomography of electrical currents
Nature Communications 10, 3379 (2019).


With a Kick-Off event on June 12th at PTB in Braunschweig we have started on our quest to use single-electron quantum optics for quantum-enhanced