## Contact

Swiss National Science Foundation (SNSF)

Wildhainweg 3P.O. Box

CH-3001 Bern

Phone +41 31 308 22 22

English title | Quantum coherence, quantum statistics, and superconductivity in mesoscopic systems |
---|---|

Applicant | Bruder Christoph |

Number | 137551 |

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 | 01.10.2011 - 30.09.2014 |

Approved amount | 441'344.00 |

condensed-matter theory; quantum coherence; quantum computing; quantum control; nanomechanics; entanglement; superconductivity; quantum transport; optomechanics; ultracold atoms

Lead |
---|

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 3 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 |
---|

Name | Institute |
---|

Publication |
---|

Adiabatic quantum pumping of chiral Majorana fermions |

Josephson effect in normal and ferromagnetic topological-insulator junctions: Planar, step, and edge geometries |

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

Quantum transport signatures of chiral edge states in Sr2RuO4 |

Signatures of tunable Majorana-fermion edge states |

Equivalence between an optomechanical system and a Kerr medium |

Majorana Fermions from Landau Quantization in a Superconductor and Topological-Insulator Hybrid Structure |

Majorana Qubit Rotations in Microwave Cavities |

Measuring Ultrasmall Time Delays of Light by Joint Weak Measurements |

Microwave-controlled coupling of Majorana bound states |

Nonsymmetrized Correlations in Quantum Noninvasive Measurements |

Point contacts and localization in generic helical liquids |

Quantum limit of laser cooling in dispersively and dissipatively coupled optomechanical systems |

Strategy for implementing stabilizer-based codes on solid-state qubits |

Strong-coupling effects in dissipatively coupled optomechanical systems |

Suppression of conductance in a topological insulator nanostep junction |

Cooling in the single-photon strong-coupling regime of cavity optomechanics |

Electron-Phonon Coupling in Crystalline Organic Semiconductors: Microscopic Evidence for Nonpolaronic Charge Carriers |

Mean-field analysis of spinor bosons in optical superlattices |

Preserving universal resources for one-way quantum computing |

Quantum-control approach to realizing a Toffoli gate in circuit QED |

Superfluid drag of two-species Bose-Einstein condensates in optical lattices |

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

Spin-1 atoms in optical superlattices: Single-atom tunneling and entanglement |

Group / person | Country |
---|

Types of collaboration |
---|

Prof. R. Fazio, Scuola Normale Superiore Pisa | Italy (Europe) |

- in-depth/constructive exchanges on approaches, methods or results |

Prof. W. Belzig, Universitaet Konstanz | Germany (Europe) |

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

Prof. Uli Zuelicke, Victoria University of Wellington | New Zealand (Oceania) |

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

Title | Type of contribution | Title of article or contribution | Date | Place | Persons involved |
---|

EPS Condensed Matter Conference | Talk given at a conference | Quantum transport signatures of chiral edge states in Sr2RuO4 using Cooper pair splitters | 25.08.2014 | Paris, France | Tiwari Rakesh; |

New frontiers for Majorana fermions, from condensed to dark matter | Talk given at a conference | Majorana fermions from Landau quantization in a superconductor-topological-insulator hybrid structure | 05.05.2014 | Frascati, Italy | Tiwari Rakesh; |

Workshop on Frontiers of Nanomechanics | Talk given at a conference | Nonlinear optomechanics, dissipative coupling, and quantum synchronization, A. Nunnenkamp | 10.09.2013 | Trieste, Italy | Bruder Christoph; |

Frontiers of Nanomechanics | Poster | Quantum Synchronization of a driven self-sustained oscillator, S. Walter | 09.09.2013 | Trieste, Italy | Bruder Christoph; |

Workshop on Quantum Many Body Systems out of Equilibrium | Talk given at a conference | Super fluid drag of two-species Bose-Einstein condensates in optical lattices, C. Bruder | 20.08.2013 | Dresden, Germany | Bruder Christoph; |

Magnonics 2013 | Poster | Magnonic crystals as a waveguide for spin waves, R.P. Tiwari | 06.08.2013 | Vaarberg, Sweden | Tiwari Rakesh; |

Conference on Frontiers of Quantum and Mesoscopic Thermodynamics (FQMT 13) | Talk given at a conference | Analog quantum simulators of small-polaron physics, V. Stojanovic | 01.08.2013 | Prag, Czech Republic | Bruder Christoph; |

Research seminar | Individual talk | Optomechanics - Controlling mechanical motion with light and vice versa, A. Nunnenkamp | 16.07.2013 | Brisbane, Australia | Bruder Christoph; |

Workshop on Majorana Physics in Condensed Matter | Poster | Majorana fermions from Landau quantization in a superconductor-topological insulator hybrid structure, R.P. Tiwari | 16.07.2013 | Erice, Italy | Tiwari Rakesh; Bruder Christoph; |

Symposium on Quantum Hall Effects and Related Topics | Poster | Majorana fermions from Landau quantization in a superconductor-topological insulator hybrid structure, R.P. Tiwari | 27.06.2013 | Stuttgart, Germany | Bruder Christoph; Tiwari Rakesh; |

Research seminar | Individual talk | Optomechanics - Controlling mechanical motion with light and vice versa, A. Nunnenkamp | 12.06.2013 | Nottingham, Great Britain and Northern Ireland | Bruder Christoph; |

Research seminar | Individual talk | Optomechanics - Controlling mechanical motion with light and vice versa, A. Nunnenkamp | 01.06.2013 | Glasgow, Great Britain and Northern Ireland | Bruder Christoph; |

Swiss Nano Convention | Poster | Is an opto-mechanical system an eective Kerr medium? S. Aldana | 23.05.2013 | Basel, Switzerland | Aldana Samuel; Bruder Christoph; |

Swiss Nano Convention | Poster | Measuring ultrasmall time delays of light by joint weak measurements, G. Strübi | 21.05.2013 | Basel, Switzerland | Strübi Grégory; Bruder Christoph; |

Workshop Control of Complex Quantum Systems | Talk given at a conference | Quantum simulation of small-polaron formation with trapped ions, V. M. Stojanovic | 28.03.2013 | Santa Barbara, United States of America | Bruder Christoph; |

DPG Spring Meeting | Talk given at a conference | Measuring ultrasmall time delays of light by joint weak measurements, G. Strübi | 13.03.2013 | Regensburg, Germany | Bruder Christoph; Strübi Grégory; |

DPG spring meeting | Talk given at a conference | Majorana fermions from Landau quantization in a superconductor-topological insulator hybrid structure, R.P. Tiwari | 12.03.2013 | Regensburg, Germany | Bruder Christoph; Tiwari Rakesh; |

Workshop on Trends in Nanoscience 2013 | Talk given at a conference | Nano- and optomechanics, C. Bruder | 27.02.2013 | Irsee, Germany | Bruder Christoph; |

Research seminar | Individual talk | Optomechanics - Controlling mechanical motion with light and vice versa, A. Nunnenkamp | 14.02.2013 | Hamburg, Germany | Bruder Christoph; |

Tutorial at the workshop on Cavity Optomechanics | Talk given at a conference | Cavity Optomechanics, A. Nunnenkamp | 11.02.2013 | Diavolezza, Switzerland | Bruder Christoph; |

Research seminar | Individual talk | Cavity optomechanics in new regimes and with new devices, A. Nunnenkamp | 10.01.2013 | Cambridge, Great Britain and Northern Ireland | Bruder Christoph; |

Theoretical Physics Seminar | Individual talk | Polarons: from Models to Materials to Quantum Simulation, V. M. Stojanovic | 11.12.2012 | Geneva, Switzerland | Bruder Christoph; |

Research seminar at EPFL | Individual talk | Cavity optomechanics in new regimes and with new devices, A. Nunnenkamp | 05.12.2012 | Lausanne, Switzerland | Bruder Christoph; |

Theoretical Physics Colloquium | Individual talk | Polarons: from Models to Materials to Quantum Simulation, V. M. Stojanovic | 26.11.2012 | Konstanz, Germany | Bruder Christoph; |

Theoretical Physics Seminar | Individual talk | Polarons: from Models to Materials to Quantum Simulation, V. M. Stojanovic | 15.11.2012 | Cambridge, Great Britain and Northern Ireland | Bruder Christoph; |

Theory colloquium | Individual talk | Cavity optomechanics in the single-photon strong-coupling regime, A. Nunnenkamp | 09.11.2012 | Hannover, Germany | Bruder Christoph; |

Workshop on Quantum Noise and Measurement in Engineered Electronic Systems | Talk given at a conference | Synthetic gauge fields in Jaynes-Cummings-Hubbard ring lattices, A. Nunnenkamp | 11.10.2012 | Dresden, Germany | Bruder Christoph; |

Workshop on Quantum Noise and Measurement in Engineered Electronic Systems | Talk given at a conference | Interferometric and noise signatures of Majorana fermions, C. Bruder | 10.10.2012 | Dresden, Germany | Bruder Christoph; |

Quantum Noise and Measurement in Engineered Electronic Systems | Poster | Measuring ultrasmall time delays of light by joint weak measurements, G. Strübi | 08.10.2012 | Dresden, Germany | Strübi Grégory; Bruder Christoph; |

34th International Workshop on Condensed Matter Theories (CMT34) | Talk given at a conference | Quantum control of interacting qubits, invited talk C. Bruder | 14.09.2012 | Pohang, Korean Republic (South Korea) | Bruder Christoph; |

Swiss-Japanese Workshop on Current Topics in the Theory of Correlated Materials | Talk given at a conference | Interferometric and noise signatures of Majorana fermions, invited talk C. Bruder | 12.09.2012 | Wakoshi, Japan, Japan | Bruder Christoph; |

Summer School on Quantum and Non-Linear Optics (QNLO 2012) | Talk given at a conference | An introduction to cavity optomechanics, invited talk A. Nunnenkamp | 29.08.2012 | Sonderborg, Denmark | Bruder Christoph; |

Chemistry Department Seminar at Harvard University | Individual talk | Polarons: from models to materials to quantum simulation, talk V. M. Stojanovic | 22.08.2012 | Cambridge, MA, United States of America | Bruder Christoph; |

Workshop on Majorana Fermions in Condensed Matter | Talk given at a conference | Interferometric and noise signatures of Majorana fermions, invited talk C. Bruder | 05.07.2012 | Leiden, Netherlands | Bruder Christoph; |

Annual Meeting of the Swiss Physical Society 2012 | Talk given at a conference | Cavity optomechanics in the single-photon strong- coupling regime, invited talk A. Nunnenkamp | 22.06.2012 | Zürich, Switzerland | Bruder Christoph; |

AMOP Seminar | Individual talk | Cavity optomechanics in the single-photon strong-coupling regime, talk A. Nunnenkamp | 24.05.2012 | London, Great Britain and Northern Ireland | Bruder Christoph; |

AMOP Seminar | Individual talk | Cavity optomechanics in the single-photon strong-coupling regime, talk A. Nunnenkamp | 22.05.2012 | Cambridge, Great Britain and Northern Ireland | Bruder Christoph; |

Microkelvin Workshop 2012 | Talk given at a conference | Interferometric and noise signatures of Majorana fermions in transport experiments, invited talk C. Bruder | 20.03.2012 | Smolenice, Slovakia | Bruder Christoph; |

Gordon Conference Mechanical Systems in the Quantum Regime | Talk given at a conference | Strongly coupled and hybrid optomechanics, invited talk A. Nunnenkamp | 08.03.2012 | Galveston, TX, United States of America | Bruder Christoph; |

Quantum control Workshop Quantum Mechanics | Talk given at a conference | From Foundations to Quantum Information Science, invited talk C. Bruder | 01.03.2012 | Bielefeld, Germany | Bruder Christoph; |

2nd international SOLID workshop | Talk given at a conference | From quantum control to one-way quantum computing in interacting qubit arrays, invited talk V. M. Stojanovic | 21.02.2012 | Grenoble, France | Bruder Christoph; |

Special Seminar | Individual talk | Nonlinear optomechanics, talk A. Nunnenkamp | 07.02.2012 | Sheffield, Great Britain and Northern Ireland | Bruder Christoph; |

Special Seminar | Individual talk | Nonlinear optomechanics, talk A. Nunnenkamp | 06.02.2012 | Leeds, Great Britain and Northern Ireland | Bruder Christoph; |

NCCR QSIT General Meeting | Poster | GHZ generation protocol for superconducting qubits, (S. Aldana, Poster) | 01.02.2012 | Arosa, Switzerland | Bruder Christoph; Aldana Samuel; |

Workshop on Josephson Junction Circuits | Talk given at a conference | Effcient multi-qubit gates SOLID Topical, invited talk C. Bruder | 17.01.2012 | Delft, Netherlands | Bruder Christoph; |

SOLID JJ Workshop | Poster | GHZ generation protocol for superconducting qubits, (S. Aldana, Poster) | 16.01.2012 | Delft, Netherlands, Netherlands | Bruder Christoph; Aldana Samuel; |

Kolloquium | Individual talk | Quantum control of interacting qubits, invited talk C. Bruder | 13.12.2011 | Erlangen, Germany | Bruder Christoph; |

Workshop on Engineering and Control of Quantum Systems, | Talk given at a conference | Quantum-control approach to superconducting qubit arrays, talk V. M. Stojanovic | 12.10.2011 | Dresden, Germany | Bruder Christoph; |

Title | Year |
---|

Rahel Heule received the Emilie-Louise-Frey-Award 2011 | 2011 |

Number | Title | Start | Funding scheme |
---|

126637 | Quantum coherence, quantum statistics, and superconductivity in mesoscopic systems | 01.10.2009 | Project funding (Div. I-III) |

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

We plan to investigate the possibility of generating entanglement between a nanomechanical oscillator and a quantum bit by controlling the time dependence of the current flowing through a quantum point contact coupled to both of them. We will study the possibility of realizing spin polarization effects using synthetic spin-orbit fields in an optical lattice. In addition, we will try to link abstract Kraus operators describing weak quantum measurements to physical detector models. We will study interferometric setups on topological insulators with the goal to find a direct signature of Majorana-type quasiparticles. Finally, we plan to propose realistic experimental schemes to prove the existence of entanglement at the output ports of a superconducting beam splitter.

Swiss National Science Foundation (SNSF)

Wildhainweg 3P.O. Box

CH-3001 Bern

Phone +41 31 308 22 22

Enter and manage your applications

Enter your e-mail address to receive the SNSF Newsletter regularly

© SNSF 2018