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Silicon Platform for Quantum Spintronics

Objective

Quantum spintronics aims at utilizing the quantum nature of individual spins to bring new functionalities into logic circuits, either to make classical information processing more efficient or to implement spin-based quantum algorithms. Two critical aspects for quantum spintronics are a long spin coherence time and a strong, tunable spin-orbit interaction for fast electrical manipulation of spins. Up to now, experiments have mainly focused on III-V semiconductor nanostructures, where hyperfine coupling with nuclear spins limits electron-spin coherence. Low nuclear spin materials, and in particular group-IV semiconductors, were found to be a natural alternative. However, in most of the currently studied group-IV based systems, spin-orbit coupling is very weak, preventing fast electrical manipulation of spins.We propose to investigate a new direction based on p-type SiGe nanostructures. This system has the unique combination of low hyperfine and strong spin-orbit couplings. Aside from developing demonstrator devices such as spin-filters or single spin qubits, we aim at exploring recently proposed schemes for long range spin-spin coupling, an essential requirement for scalable qubit circuits. To investigate hole-spin dynamics and achieve quantum spintronic functionalities, novel types of concepts will be experimentally investigated (spin-polarized helical states, spin-orbit mechanisms for spin-selective tunneling and long-range spin-spin coupling, etc.). Because of the higher complexity of hole-type systems, a dedicated theoretical framework will be developed in support to experiments. In addition to a bottom-up approach which has been successful in providing nanowire and quantum-dot heterostructures, we shall realize SiGe quantum devices by means of state-of-the-art CMOS technology. This will allow us to know how spin-based functionalities demonstrated in bottom-up nanostructures can be implemented into a truly scalable silicon platform.
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Coordinator

COMMISSARIAT A L ENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES

Address

Rue Leblanc 25
75015 Paris 15

France

Activity type

Research Organisations

EU Contribution

€ 822 538

Administrative Contact

Jérôme Planès (Dr.)

Participants (5)

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UNIVERSITAT LINZ

Austria

EU Contribution

€ 355 276

IBM RESEARCH GMBH

Switzerland

EU Contribution

€ 486 615

UNIVERSITAT BASEL

Switzerland

EU Contribution

€ 355 999

KOBENHAVNS UNIVERSITET

Denmark

EU Contribution

€ 480 000

TECHNISCHE UNIVERSITEIT DELFT

Netherlands

EU Contribution

€ 480 000

Project information

Grant agreement ID: 323841

Status

Closed project

  • Start date

    1 September 2013

  • End date

    31 August 2016

Funded under:

FP7-ICT

  • Overall budget:

    € 4 253 342

  • EU contribution

    € 2 980 428

Coordinated by:

COMMISSARIAT A L ENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES

France