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Quantum theory of condensed matter: spin effects in nanostructures and quantum information

English title Quantum theory of condensed matter: spin effects in nanostructures and quantum information
Applicant Loss Daniel
Number 152896
Funding scheme Project funding (Div. I-III)
Research institution Departement Physik Universität Basel
Institution of higher education University of Basel - BS
Main discipline Theoretical Physics
Start/End 01.10.2014 - 30.09.2018
Approved amount 750'000.00
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All Disciplines (2)

Discipline
Theoretical Physics
Condensed Matter Physics

Keywords (8)

quantum memory; quantum computing; nanotubes and graphene; quantum spintronics and quantum coherence; quantum dots; correlation effects; hyperfine interaction; spin orbit interactions

Lay Summary (German)

Lead
Unser Forschubgsprojekt befasst sich mit der theoretischen Quantenphysik von Festkoerpersystemen mit Schwerpunkt auf Quantum Computing. Ein wichtiges Ziel ist, die Grundlagenprobleme, die beim Bau eines Quantencomputers im Halbleiter auftreten, zu verstehen und zu loesen. Wir sind Pioniere auf diesem Gebiet und gehoeren zu den weltweit fuehrenden Gruppen.
Lay summary

Das vorliegende Forschungsprojekt befasst sich mit mehreren zusammenhaengenden Fragestellungen aus dem Gebiet der Quantentheorie des Festkoerpers und Quantum Computing. Es traegt zum langfristigen Ziel bei, realistische Architekturen zu finden, die eine phasenkohaerente Manipulation von Festkoerpersystemen auf dem Quantenniveau erlauben. Da dieses Ziel  notwendigerweise das Grundlagenstudium von komplexen Vielteilchensystemen involviert, erstreckt sich unsere Forschung ueber viele Untergebiete der modernen Quantenphysik im Festkoerper und benutzt dazu eine breite Palette von hochspezialisierten mathematischen Methoden. Ein Hauptschwerpunkt sind Spinsysteme  im Halbleiter, die wahrscheinlich vielversprechendensten Kandidatensysteme fuer Quanetncomputer ueberhaupt.

 

Direct link to Lay Summary Last update: 17.10.2014

Responsible applicant and co-applicants

Employees

Publications

Publication
Fast long-distance control of spin qubits by photon-assisted cotunneling
Stano P., Klinovaja J., Braakman F. R., Vandersypen L. M. K., Loss D. (2015), Fast long-distance control of spin qubits by photon-assisted cotunneling, in Physical Review B, 92(7), 16-16.

Collaboration

Group / person Country
Types of collaboration
Prof. Halperin/Harvard United States of America (North America)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Exchange of personnel
Prof. A. Azdani/Princeton University United States of America (North America)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
Prof. A. Yacoby/Harvard United States of America (North America)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Exchange of personnel

Awards

Title Year
King Faisal Prize in Science 2017 2017

Associated projects

Number Title Start Funding scheme
134470 Quantum theory of condensed matter: spin effects in nanostructures and quantum information 01.04.2011 Project funding (Div. I-III)
182058 Quantum theory of condensed matter: spin effects in nanostructures and quantum information 01.10.2019 Project funding (Div. I-III)

Abstract

RESEARCH SUMMARYThe proposed research covers and interconnects multiple topics from the fields of quantum computing and condensed-matter theory. It contributes to the long term goal of finding realistic architectures that allow the coherent manipulation at the quantum level.The strategy we pursue encompasses the refinement of the well-established scheme of spin-based quantum computing, as well as efforts to discover novel and realistic platforms that allow the storage and manipulation of quantum information. In view of realistic scalability, we focus on the solid state as the basis of our research. Exciting and promising new materials will be examined and their suitability for quantum information processing will be evaluated. Moreover, we will study intriguing issues that are also of interest in fundamental research, ranging from novel types of quantum phase transitions to non-equilibrium dynamics. Also these fundamental aspects of our proposal are targeted on the ability to gain access to the quantum world. In particular, we plan to work on the following topics:2.A Architectures for robust storage of quantum information: Quantum error correction with thesurface code. Toric code. Long range interaction between anyons. Kitaev honeycomb model coupled to cavity modes. Realistic implementations of quantum error correction.2.B Magnetic properties of cabon-based materials: Quantum phase transition between an ordinaryLuttinger liquid and a one-dimensional itinerant ferromagnet at graphene/graphane interfaces. Spin-spin correlations and RKKY interaction in graphene and carbon nanotubes.2.C Nanotubes and spin-orbit interaction: Spin-orbit gap at the Dirac point. Interaction with an externalelectric field. Carbon nanotubes as spin-filters.2.D Nuclear spin dynamics in interacting electron systems: Generalized master equation for nuclearspins in contact with interacting electron systems. Non-Markovian time evolution. Coherent nuclear spin dynamics and quantum information.2.E Interaction effects and spin-orbit coupling in two dimensional electron systems: Non-analytic momentum-dependence of the electron spin susceptibility in the presence of Rashba spin-orbit interaction.Renormalization in the Cooper channel. Nuclear magnetism.2.F Quantum dots and spin states in Ge/Si core-shell nanowires: Manipulation of hole spins by electric or magnetic fields. Hole spin relaxation due to spin-phonon interaction.2.G Nuclear spins and optical pumping: Dynamical manipulation of nuclear spins by optical pumping.Quantum optics. Emission polarization inversion. Entanglement of spins in quantum dots via single photoninterference.2.H Spin transport in non-itinerant quantum systems: Control of spin transport in one dimension.Rectification of spin currents. Spintronics with low energy dissipation.
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