Single-electron electronics and
quantum optics with flying electrons (WP3-3)

  Host: Neel Institut (CNRS)
Supervisor: C. Bäuerle (CNRS), Co-supervisor: C.J.B. Ford (UCAM)

Grenoble

Hermann Edlbauer

Variety has become an important factor in my professional and personal development.
Therefore, I have decided to change the topic and location of my future research after completing my master’s degree in my native country Austria.
For my master’s thesis at the Institute of Solid State Physics at Graz University of Technology I performed large-scale density functional theory simulations to investigate how successive hydrogenation of acenequinone molecules adsorbed on coinage metal surfaces affects the work function and the electron potential distribution.
In this course I wrote my first paper “Postadsorption Work Function Tuning via Hydrogen Pressure Control” published in November 2015 at The Journal of Physical Chemistry C.
Now I am heading for a new scientific challenge: Performing interference experiments with single electrons “surfing” on surface-acoustic-waves in Grenoble.

Objectives


In this project we will build on recent advances on single-electron transport assisted by SAWs where flying electrons have been transported by a SAW, demonstrating high fidelity for both single-electron emission and single-electron detection. This opens the possibility to perform quantum-optics experiments with electrons in solid-state devices. Since electrons in solids are strongly interacting particles, new quantum-entanglement schemes can be envisioned, not possible with photons.

Our goal is to develop all the basic elements needed to realise quantum-optics experiments with flying electrons such as beam splitters, phase control and controlled interaction. This can be achieved by bringing two SAW channels together and tunnel-coupling them over a distance of several microns. One can also exploit the Coulomb interaction to control the phase of a single electron on the fly. Putting all these blocks together should allow the realisation of a controlled phase gate for flying electrons, a two-qubit gate.

Expected Results


ESR11-CNRS will fabricate the SAW devices, learning all basic nanofabrication steps (laser and e-beam lithography). Optimisation of IDTs in collaboration with PDI and TWENTE will be important for maximal IDT efficiency. The ESR will characterise the samples at low temperature, learn about sophisticated RF detection techniques and investigate charge- as well as spin-coherent properties of flying electrons. By interacting with UCAM and PDI the ESR will learn complementary techniques (optical rather than electrical detection).

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