## Contact

Swiss National Science Foundation (SNSF)

Wildhainweg 3P.O. Box

CH-3001 Bern

Phone +41 31 308 22 22

Applicant | Bruder Christoph |
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Number | 126637 |

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 | 01.10.2009 - 30.09.2011 |

Approved amount | 313'109.00 |

condensed-matter theory; quantum coherence; nanomechanics; ultracold atoms; mesoscopic superconductivity; ; noise and full counting statistics;

Lead |
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Lay summary |

The physics of mesoscopic systems, i.e., electronic structures in the nanometer range, is one of the most active research areas of condensed-matter physics. These systems allow us to study fundamental physics questions, and their understanding is a necessary prerequisite for possible future electronic device applications. The goal of our research is to exploit and analyze quantum interference effects in such electronic circuits. In the last couple of years, new exciting areas have opened up, like nanomechanics, or the interface of ultracold atoms and condensed-matter systems.In particular, our group (about 2 PhD students and 3 Postdocs) plans to study the interplay of electric currents through nanostructures with mechanical degrees of freedom (nanomechanics). We are also interested in fluctuation and noise phenomena: electrical currents are not exactly constant but fluctuate, and these fluctuations contain a great deal of information about the quantum nature of the electrons that carry the current. We will also investigate ultracold atoms which can be used to study quantum coherence and quantum many-body phenomena. Cold atoms can be trapped in so-called optical lattices and show similarities to electrons in a crystal lattice. The great advantage of cold atoms is that the properties of the lattice can be controlled much more easily than in the case of a crystal lattice. Finally, we are also interested in the foundations of quantum mechanics (entanglement, weak measurements in solid-state systems). |

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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Interferometric and noise signatures of Majorana fermion edge states in transport experiments |

Controlling qubit arrays with anisotropic XXZ Heisenberg interaction by acting on a single qubit |

Ideal quantum nondemolition measurement of a flux qubit at variable bias |

Effects of a single fermion in a Bose Josephson junction |

Local quantum control of Heisenberg spin chains |

Greenberger-Horne-Zeilinger generation protocol for N superconducting transmon qubits capacitively coupled to a quantum bus |

Polaronic signatures and spectral properties of graphene antidot lattices |

Detection of Qubit-Oscillator Entanglement in Nanoelectromechanical Systems |

One-step multiqubit Greenberger-Horne-Zeilinger state generation in a circuit QED system |

Electron-phonon coupling in graphene antidot lattices: An indication of polaronic behavior |

Interplay of the Aharonov-Bohm effect and Klein tunneling in graphene |

Quantum transport through single-molecule junctions with orbital degeneracies |

Title | Type of contribution | Title of article or contribution | Date | Place | Persons involved |
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Workshop in Electronic Correlations in Models and Materials | 14.09.2011 | Augsburg, Deutschland |

Frontiers of Quantum and Mesoscopic Thermodynamics | 24.07.2011 | Prague, Czech Republic |

Swiss-Swedish Meeting on Quantum Materials and Devices | 09.01.2011 | Les Diablerets, Schweiz |

KITP Workshop Beyond Standard Optical Lattices | 01.11.2010 | Santa Barbara, USA |

Ruperto-Carola-Symposium on Hybrid Quantum Systems | 13.05.2010 | Heidelberg, Deutschland |

Gordon Conference on Mechanical systems in the quantum regime | 21.03.2010 | Galveston, USA |

Title | Date | Place |
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Workshop on "Atomic physics using superconducting qubits" | 16.05.2011 | Beijing, China |

Communication | Title | Media | Place | Year |
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Talks/events/exhibitions | Geheimnisvolle Quantenwelt | German-speaking Switzerland | 17.04.2010 |

Number | Title | Start | Funding scheme |
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137551 | Quantum coherence, quantum statistics, and superconductivity in mesoscopic systems | 01.10.2011 | Project funding (Div. I-III) |

155933 | Quantum coherence, quantum statistics, and superconductivity in mesoscopic systems | 01.10.2014 | Project funding (Div. I-III) |

117603 | Quantum coherence, quantum statistics, and superconductivity in mesoscopic systems | 01.10.2007 | Project funding (Div. I-III) |

We want to generalize current theoretical models of quantum point contact (QPC) position detectors in nanomechanical systems by considering a scattering theory of the QPC where tunneling is no longer assumed to be small. We plan to investigate the possibility of generating entanglement between two nanomechanical oscillators by simultaneous measurement of the position of the two oscillators by a single tunnel junction. We will study the perspectives of a suspended nanomechanical device as a detector of frequency-dependent quantum noise. We will study the dynamics of ultra-cold atoms in optical superlattices and the entanglement in such multipartite systems. We will also investigate the single-atom staircase for double-well lattices containing a mixture of bosonic and fermionic atoms. We will study the weak measurement theory of solid-state qubits. We will investigate the onset of the Josephson effect between two fermionic reservoirs (superconductors/superfluids) using a number-conserving theory. We will investigate current cross-correlations in a superconducting beam splitter if the superconductor is characterized by a non-trivial state.

Swiss National Science Foundation (SNSF)

Wildhainweg 3P.O. Box

CH-3001 Bern

Phone +41 31 308 22 22

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