## Contact

Swiss National Science Foundation (SNSF)

Wildhainweg 3P.O. Box

CH-3001 Bern

Phone +41 31 308 22 22

English title | Quantum effects in nanomechanical and optomechanical systems |
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Applicant | Schmidt Thomas |

Number | 136832 |

Funding scheme | Ambizione |

Research institution | Departement Physik Universität Basel |

Institution of higher education | University of Basel - BS |

Main discipline | Condensed Matter Physics |

Start/End | 01.02.2012 - 28.02.2015 |

Approved amount | 510'951.00 |

Discipline |
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Condensed Matter Physics |

Theoretical Physics |

Theoretical condensed matter physics; Mescoscopic physics; Quantum mechanics;

Lead |
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Lay summary |

Nanomechanical and optomechanical systems have attracted much attention among experimental and theoretical physicists in the past years. Advances in lithographic techniques have made it possible to manufacture nanomechanical resonators (NRs) with lateral dimensions of a few nanometers and lengths of a few microns, and to integrate them into experimental setups to measure their dynamical properties. The interest in these systems is mainly owed to two aspects: first, it has been realized that NRs react very sensitively to external forces. Since their properties can be read out very accurately using electronic or optical methods, this facilitates the design of ultrasensitive measurement devices for, e.g., charge, mass and force. A second, more fundamental, incentive to study nanomechanical systems stems from the fact that due to their sizes, they operate at the boundary between classical mechanics and quantum mechanics. In the past years, there have been experimental attempts to look for signatures of quantum physics in these systems, and experiments are approaching the required accuracy. So far, however, a direct detection of a quantum state in a macroscopic system like an NR has been elusive. In this project, I would like to theoretically investigate possible nanomechanical setups in which it is possible to observe quantum mechanical properties of mechanical resonators, and find systems which allow a level of control over nanomechanical systems which could enable the generation of true quantum states, e.g. superpositions or entangled states. |

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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Detecting nonlocal {C}ooper pair entanglement by optical {B}ell inequality violation |

Non-Abelian parafermions in time-reversal invariant interacting helical systems |

Detecting an exciton crystal by statistical means |

Electron transport in multiterminal networks of Majorana bound states |

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

Structure factor of interacting one-dimensional helical systems |

Finite-temperature conductance of interacting quantum wires with Rashba spin-orbit coupling |

Majorana Qubit Rotations in Microwave Cavities |

Microwave-controlled coupling of Majorana bound states |

Point contacts and localization in generic helical liquids |

Strongly correlated dynamics in multichannel quantum {RC} circuits |

Transport properties of double quantum dots with electron-phonon coupling |

Finite-frequency noise properties of the nonequilibrium Anderson impurity model |

Inelastic Electron Backscattering in a Generic Helical Edge Channel |

One-dimensional quantum liquids: Beyond the Luttinger liquid paradigm |

Rydberg crystallization detection by statistical means |

Group / person | Country |
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Types of collaboration |
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Prof. A. Komnik | Germany (Europe) |

- Publication |

Prof. K. Le Hur | France (Europe) |

- Publication |

Prof. C. Bruder | Switzerland (Europe) |

- Publication |

Prof. L. Glazman | United States of America (North America) |

- Publication |

Prof. P. Recher | Germany (Europe) |

- Publication |

Prof. B. Trauzettel | Germany (Europe) |

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

Prof. D. Loss | Switzerland (Europe) |

- Publication |

Title | Type of contribution | Title of article or contribution | Date | Place | Persons involved |
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TopOsLo | Talk given at a conference | Electronic transport in one-dimensional generic helical liquids | 10.12.2014 | Oslo, Norway | Schmidt Thomas; |

New Trends in Topological Insulators | Talk given at a conference | Fractional Majorana fermions in strongly interacting helical liquids | 08.07.2014 | Berlin, Germany | Schmidt Thomas; |

DPG-Frühjahrstagung 2014 | Talk given at a conference | Non-Abelian quasiparticles in strongly interacting helical liquids | 02.04.2014 | Dresden, Germany | Schmidt Thomas; |

NCCR QSIT Arosa Meeting+Winterschool | Poster | Transport properties of generic helical liquids | 03.02.2014 | Arosa, Switzerland | Orth Christoph; Schmidt Thomas; |

Trends in Theory of Correlated Materials 2013 | Talk given at a conference | Transport properties of interacting helical systems | 05.10.2013 | Lausanne, Switzerland | Schmidt Thomas; |

Frontiers of Quantum and Mesoscopic Thermodynamics | Talk given at a conference | Majorana Bound States and Harmonic Oscillators | 29.07.2013 | Prag, Czech Republic | Schmidt Thomas; |

Conference on Majorana physics in condensed matter | Individual talk | Manipulation of Majorana bound states in microwave cavities | 12.07.2013 | Erice, Italy | Schmidt Thomas; |

Workshop on Interferometry and Interactions in Non-Equilibrium Meso- and Nano- Systems Triest | Poster | Transport properties of point contacts between helical edge states | 08.04.2013 | Trieste, Italy | Orth Christoph; |

DPG Frühjahrstagung 2013 | Talk given at a conference | One-dimensional quantum systems beyond the Luttinger liquid paradigm | 12.03.2013 | Regensburg, Germany | Orth Christoph; Schmidt Thomas; |

Spin-orbit and interaction effects in nano-electronics | Poster | Microwave-controlled manipulation of Majorana bound states | 04.02.2013 | Aachen (Deutschland), Germany | Schmidt Thomas; |

NCCR QSIT Meeting Arosa | Talk given at a conference | Manipulation of Majorana bound states in microwave cavities | 30.01.2013 | Arosa, Switzerland | Schmidt Thomas; |

Topological States of Matter | Poster | Microwave-controlled manipulation of Majorana bound states | 14.01.2013 | Aspen (USA), United States of America | Schmidt Thomas; |

NCTS workshop on novel quantum phenomena in mesoscopic systems | Talk given at a conference | One-dimensional quantum systems beyond the Luttinger liquid paradigm | 14.12.2012 | Hsinchu (Taiwan), Taiwan | Schmidt Thomas; |

Quantum Noise and Measurement in Engineered Electronic Systems | Poster | Transport Properties of Point Contacts in Quantum Spin Hall Insulators | 08.10.2012 | Dresden (Deutschland), Germany | Schmidt Thomas; |

SMR 2360: Workshop on Majorana Fermions, Non-Abelian Statistics and Topological Quantum Information Processing | Poster | Transport Properties of Point Contacts in Quantum Spin Hall Insulators | 20.08.2012 | Trieste (Italien), Italy | Schmidt Thomas; |

SPS Meeting 2012 | Talk given at a conference | Interacting fermions in one dimension beyond the Luttinger liquid theory | 21.06.2012 | Zürich, Switzerland | Schmidt Thomas; |

International School of Physics "Enrico Fermi" | Poster | Finite Frequency Noise Spectrum of the Anderson Impurity Model | 19.06.2012 | Varenna (Italien), Italy | Orth Christoph; |

DPG Frühjahrstagung 2012 | Talk given at a conference | INELASTIC ELECTRON BACKSCATTERING IN A GENERIC HELICAL EDGE CHANNEL | 26.03.2012 | Berlin (Deutschland), Germany | Schmidt Thomas; |

DPG Frühjahrstagung 2012 | Poster | Finite Frequency Noise Spectrum of the Anderson Impurity Model | 26.03.2012 | Berlin, Germany | Orth Christoph; |

Topological States of Matter | Talk given at a conference | INELASTIC ELECTRON BACKSCATTERING IN A GENERIC HELICAL EDGE CHANNEL | 19.03.2012 | Freiburg (Deutschland), Germany | Schmidt Thomas; |

APS March Meeting 2012 | Talk given at a conference | Inelastic electron scattering in a generic helical edge channel | 27.02.2012 | Boston (USA), United States of America | Schmidt Thomas; |

In numerous experiments, quantum mechanics has proved to be an extremely successful theory for the description of all microscopic phenomena involving elementary particles, atoms or molecules. On macroscopic scales, on the other hand, quantum mechanical effects like superpositions of states or entanglement are usually completely absent. Despite the long history of this dichotomy, the transition between quantum mechanics and classical mechanics is not yet fully understood.The investigation of nanomechanical and optomechanical systems promises to shed light on this problem. Originally conceived as ultrasensitive measurement devices, it has become clear that the levels of control and isolation which can be achieved in these systems could be sufficient to bring a mechanical oscillator, consisting of billions of atoms, into a quantum state. Recent experiments on nanomechanical and optomechanical systems are on the verge of reaching the quantum regime. While strong hints of quantum effects have already been found, however, the direct experimental observation of quantum mechanics in mechanical systems remains elusive. Therefore, this project will investigate possible ways to observe quantum effects in these systems.One part of this project is dedicated to the development of the necessary general theoretical concepts for the creation and detection of quantum states in mechanical systems. These theories will be applicable to a large class of experimental setups and will try to answer the question of how quantum states involving mechanical resonators can in principle be created and detected. The second part of the project will investigate the most common experimental setups in more detail. Here, in collaboration with experimentalists in Basel and elsewhere, the aim is to develop concrete experimental proposals which can be implemented using the technology existing today.

Swiss National Science Foundation (SNSF)

Wildhainweg 3P.O. Box

CH-3001 Bern

Phone +41 31 308 22 22

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