Accueil du site Collaborations / Réseaux Bourses européennes 2012 — Tristan Meunier, ERC starting grant

2012 — Tristan Meunier, ERC starting grant

- Name of the Principal Investigator : Tristan Meunier (PI)
- Name of the PI’s host institution : CNRS-Institut Néel
- Full Title : Quantum Coherence and Manipulation of a Single Flying Electron Spin
- Short title : « QSPINMOTION »
- Duration in months : « 60 months »

In quantum nanoelectronics, a major goal is to use quantum mechanics in order to build efficient nanoprocessors. This requires the ability to control electronic phenomena in a nanostructure at the single electron level. In this context, the electron’s spin has been identified as an appropriate degree of freedom for efficient storage and manipulation of quantum information. The defined building block of this quantum computer strategy is called a spin qubit. Towards such goals, intense experimental effort has been invested in AlGaAs heterostructures where quantum dots containing just one electron can be realized. In such a system, an all-electrical quantum manipulation of the spin of a single electron is possible. The implementation of the system as a quantum nanoprocessor resembles the classical circuit boards contained in a classical computer. All the basic operations of a quantum nanoprocessor have been demonstrated in spin qubits and they constitute a very promising platform to study spin dynamics at the single electron level. To scale up the spin qubit system, one has to make two distant qubits interact by exchanging a quantum particle between them. This has been demonstrated recently at the Néel Institute : a single electron has been transferred efficiently between two distant quantum dots on a timescale faster than the spin decoherence time. The aim of the European grant project is to give a new dimension to the spin qubit system by investigating quantum coherence and the manipulation of such a single "flying" electron spin. Displacing a single electron spin coherently not only represents a viable solution towards achieving entanglement between distant qubits but also opens new ways of manipulating electron spins coherently via spin-orbit interaction. The strategy pursued consists in combining single electron transport with the known techniques for measurement and coherent control of a single electron spin in a quantum dot. The new knowledge expected from these experiments is likely to have a broad impact extending from quantum spintronics to other areas of nanoelectronics.

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