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PhD position: Quantum interference and quantum entanglement with single-electron flying qubits

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Français - Anglais

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General information

Reference : UPR2940-FLOPOI-022
Workplace : GRENOBLE
Date of publication : Monday, May 11, 2020
Scientific Responsible name : Christopher BAUERLE
Type of Contract : PhD Student contract / Thesis offer
Contract Period : 36 months
Start date of the thesis : 1 September 2020
Proportion of work : Full time
Remuneration : 2 135,00 € gross monthly

Description of the thesis topic

Coherent manipulation of single electrons in solid-state devices is attractive for quantum information purposes because they have a high potential for scalability. Depending on the system used, the charge or the spin may code binary qubit information. A particular appealing idea is to use a single flying electron itself as the conveyor of quantum information.
Such electronic flying qubits allow performing quantum operations on qubits while they are being coherently transferred. Information processing typically takes place in the nodes of the quantum network on locally controlled qubits, but quantum networking would require flying
qubits to exchange information from one location to another. It is therefore of prime interest to develop ways of transferring information from one node to the other. The availability of flying qubits would enable the possibility to develop new non-local architectures for quantum
computing with possibly cheaper hardware overhead than e.g. surface codes.
The aim of the proposed PhD project is to develop a flying qubit architecture using singleelectron charge pulses. For this we will employ a Mach Zehnder interferometer and manipulate the quantum state in flight through electrostatic gates. Connecting two of such quantum interferometers via Coulomb coupling, we intend to demonstrate entanglement of the propagating electron
wave packets.
The candidate should have a strong background in quantum
mechanics and solid-state physics and experience with experimental physics. Skills in cryogenics, nanofabrication, radio-frequency electronics or programming (python) would be an asset.

Work Context

The student will be part of the QuantECA team, at Institut Néel, which has a strong expertise in quantum nano-electronics and quantum manipulation of single electrons. The Institut NEEL is one of the largest French national research institutes for fundamental research in condensed matter physics enriched by interdisciplinary activities at the interfaces with chemistry, engineering and biology. It is located in the heart of a unique scientific, industrial and cultural environment. It is part of one of Europe's biggest high-tech environment in micro- and nanoelectronics, right next to the French Alpes.
This project will be carried out in close collaboration with theoreticians (X. Waintal, CEA Grenoble) and experimentalists (C. Glattli, CEA Saclay and S. Takada, Quantum Metrology Institute, AIST, Tsukuba, Japan) which are involved in the project.
Scientific supervisors : C. Bauerle (principal) & F. Lefloch

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