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Swiss National Science Foundation (SNSF)

Wildhainweg 3P.O. Box

CH-3001 Bern

Phone +41 31 308 22 22

English title | Quantum theory of condensed matter: spin effects in nanostructures and quantum information |
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Applicant | Loss Daniel |

Number | 134470 |

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 | 01.04.2011 - 30.09.2014 |

Approved amount | 612'796.00 |

Discipline |
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Theoretical Physics |

Condensed Matter Physics |

Lead |
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Lay summary |

The proposed research covers and interconnects multiple topics from the elds of quantum computing and condensed-matter theory. It contributes to the long term aim of nding realistic architectures that allow the coherent manipulation of nature at the quantum level. The strategy we pursue encompasses the renement 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 the desired industrial feasibility and scalability of the results, 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. Keywords: quantum memory; quantum error correction; spin-based quantum computing; optical pumping; spin transport; graphene; edge magnetism; carbon nanotubes; nuclear magnetism; nuclear spin dynamics; RKKY interaction; spin-orbit interaction; quantum dots, quantum wires, and 2DEGs; electron-electron interaction; spin-phonon interaction; reduced dimensions |

Direct link to Lay Summary | Last update: 21.02.2013 |

Name | Institute |
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Name | Institute |
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Publication |
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Anisotropic g factor in InAs self-assembled quantum dots |

Breakdown of surface-code error correction due to coupling to a bosonic bath |

Characterization of Spin-Orbit Interactions of GaAs Heavy Holes Using a Quantum Point Contact |

Characterization of spin-orbit interactions of GaAs heavy holes using a quantum point contact. |

Effective quantum-memory Hamiltonian from local two-body interactions |

Efficient Markov chain Monte Carlo algorithm for the surface code |

Error Correction for Non-Abelian Topological Quantum Computation |

Helical nuclear spin order in a strip of stripes in the quantum Hall regime |

Integer and fractional quantum Hall effect in a strip of stripes |

Low-energy properties of fractional helical Luttinger liquids |

Parafermions in an Interacting Nanowire Bundle |

Parafermions in an interacting nanowire bundle. |

Phonon-mediated decay of singlet-triplet qubits in double quantum dots |

Phonon-mediated decay of singlet-triplet qubits in double quantum dots (vol 89, 085410, 2014) |

Proposal for a quantum magnetic RC circuit. |

Quantum charge pumping through fractional fermions in charge density modulated quantum wires and Rashba nanowires |

Renormalization of anticrossings in interacting quantum wires with Rashba and Dresselhaus spin-orbit couplings |

Structure factor of interacting one-dimensional helical systems |

Time-reversal invariant parafermions in interacting Rashba nanowires |

Transport Signatures of Fractional Fermions in Rashba Nanowires |

Transport signatures of fractional fermions in Rashba nanowires. |

Circuit QED with hole-spin qubits in Ge/Si nanowire quantum dots |

Correlations between Majorana fermions through a superconductor. |

Enhanced thermal stability of the toric code through coupling to a bosonic bath |

Fractional fermions with non-Abelian statistics. |

Long-Distance Entanglement of Spin Qubits via Ferromagnet |

Magnetically defined qubits on 3D topological insulators. |

Topological edge states and fractional quantum Hall effect from umklapp scattering. |

Topological Superconductivity and Majorana Fermions in RKKY Systems |

Topological superconductivity and Majorana fermions in RKKY systems. |

Vortex loops and Majoranas |

Composite Majorana fermion wave functions in nanowires |

Controlling the Interaction of Electron and Nuclear Spins in a Tunnel-Coupled Quantum Dot |

Cotunneling in the v=5/2 fractional quantum Hall regime |

Crossed Andreev reflection in quantum wires with strong spin-orbit interaction |

Decoherence of Majorana qubits by noisy gates |

Effect of strain on hyperfine-induced hole-spin decoherence in quantum dots |

Electric-field-induced Majorana Fermions in Armchair Carbon Nanotubes |

Electric-field-induced Majorana fermions in armchair carbon nanotubes. |

Exchange-based CNOT gates for singlet-triplet qubits with spin-orbit interaction |

Ferromagnetic order of nuclear spins coupled to conduction electrons: A combined effect of electron-electron and spin-orbit interactions |

Frequency-dependent transport through a spin chain |

Helical states in curved bilayer graphene |

High Threshold Error Correction for the Surface Code |

High threshold error correction for the surface code. |

Hyperfine-induced decoherence in triangular spin-cluster qubits |

Incoherent dynamics in the toric code subject to disorder |

Incoherent dynamics in the toric code subject to disorder |

libCreme: An optimization library for evaluating convex-roof entanglement measures |

Localized End States in Density Modulated Quantum Wires and Rings |

Localized end states in density modulated quantum wires and rings |

Localized end states in density modulated quantum wires and rings. |

Long-Distance Spin-Spin Coupling via Floating Gates |

Majorana qubit decoherence by quasiparticle poisoning |

Majorana states in inhomogeneous spin ladders |

Rashba spin orbit interaction in a quantum wire superlattice (vol 85, 045306, 2012) |

Rashba spin-orbit interaction in a superlattice of quantum wires |

Singlet-triplet splitting in double quantum dots due to spin-orbit and hyperfine interactions |

Thin-Film Magnetization Dynamics on the Surface of a Topological Insulator |

Thin-film magnetization dynamics on the surface of a topological insulator. |

Transition from fractional to Majorana fermions in Rashba nanowires. |

Absence of Spontaneous Magnetic Order of Lattice Spins Coupled to Itinerant Interacting Electrons in One and Two Dimensions |

Absence of spontaneous magnetic order of lattice spins coupled to itinerant interacting electrons in one and two dimensions. |

Carbon nanotubes in electric and magnetic fields |

Controlling the interaction of electron and nuclear spins in a tunnel-coupled quantum dot. |

Helical Modes in Carbon Nanotubes Generated by Strong Electric Fields |

Helical modes in carbon nanotubes generated by strong electric fields. |

Low-bias negative differential resistance in graphene nanoribbon superlattices |

Majorana Edge States in Interacting One-Dimensional Systems |

Majorana edge states in interacting one-dimensional systems. |

Physical solutions of the Kitaev honeycomb model |

Rectification of spin currents in spin chains |

Schrieffer-Wolff transformation for quantum many-body systems |

Spectrum of an Electron Spin Coupled to an Unpolarized Bath of Nuclear Spins (vol 16, 106803, 2011) |

Spectrum of an electron spin coupled to an unpolarized bath of nuclear spins. |

Strong spin-orbit interaction and helical hole states in Ge/Si nanowires |

Universal quantum computation with ordered spin-chain networks |

Group / person | Country |
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Types of collaboration |
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Harvard (Halperin, Yacoby, Marcus, Yaffe) | United States of America (North America) |

- in-depth/constructive exchanges on approaches, methods or results - Publication - Exchange of personnel |

Title | Year |
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Marcel Benoist Prize 2010. Blaise Pascal Medal in Physics 2014, European Academy of Sciences. Member of the European Academy of Sciences (2013). Member of the German National Academy of Sciences Leopoldina (2014). | 2014 |

Number | Title | Start | Funding scheme |
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119774 | Condensed matter theory: Magnetism, electron-transport and spintronics in nanostructures | 01.04.2008 | Project funding (Div. I-III) |

152896 | Quantum theory of condensed matter: spin effects in nanostructures and quantum information | 01.10.2014 | Project funding (Div. I-III) |

RESEARCH SUMMARYThe proposed research covers and interconnects multiple topics from the fields of quantum computing andcondensed-matter theory. It contributes to the long term goal of finding realistic architectures that allow thecoherent manipulation at the quantum level.The strategy we pursue encompasses the refinement of the well-established scheme of spin-based quantumcomputing, as well as efforts to discover novel and realistic platforms that allow the storage and manipulationof quantum information. In view of realistic scalability, we focuson the solid state as the basis of our research. Exciting and promising new materials will be examined andtheir suitability for quantum information processing will be evaluated. Moreover, we will study intriguing issuesthat are also of interest in fundamental research, ranging from novel types of quantum phase transitions tonon-equilibrium dynamics. Also these fundamental aspects of our proposal are targeted on the ability to gainaccess 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 cavitymodes. 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 cor-relations 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 spindynamics and quantum information.2.E Interaction effects and spin-orbit coupling in two dimensional electron systems: Non-analyticmomentum-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 electricor 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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Phone +41 31 308 22 22

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