Project

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Quantum effects in nanomechanical and optomechanical systems

English title Quantum effects in nanomechanical and optomechanical systems
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
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All Disciplines (2)

Discipline
Condensed Matter Physics
Theoretical Physics

Keywords (4)

Theoretical condensed matter physics; Mescoscopic physics; Quantum mechanics;

Lay Summary (English)

Lead
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

Responsible applicant and co-applicants

Employees

Publications

Publication
Detecting nonlocal {C}ooper pair entanglement by optical {B}ell inequality violation
Nigg Simon, Tiwari Rakesh, Walter Stefan, Schmidt Thomas (2015), Detecting nonlocal {C}ooper pair entanglement by optical {B}ell inequality violation, in Phys. Rev. B, 91, 094516.
Non-Abelian parafermions in time-reversal invariant interacting helical systems
Orth Christoph P., Tiwari Rakesh P., Meng Tobias, Schmidt Thomas L. (2015), Non-Abelian parafermions in time-reversal invariant interacting helical systems, in Phys. Rev. B, 91, 081406-081406.
Detecting an exciton crystal by statistical means
Breyel D., Soller H., Schmidt T. L., Komnik A. (2014), Detecting an exciton crystal by statistical means, in Physica B, 441, 33-33.
Electron transport in multiterminal networks of Majorana bound states
Weithofer Luzie, Recher Patrik, Schmidt Thomas L. (2014), Electron transport in multiterminal networks of Majorana bound states, in Phys. Rev. B, 90, 205416-205416.
Josephson effect in normal and ferromagnetic topological-insulator junctions: Planar, step, and edge geometries
Nussbaum Jennifer, Schmidt Thomas L., Bruder Christoph, Tiwari Rakesh P. (2014), Josephson effect in normal and ferromagnetic topological-insulator junctions: Planar, step, and edge geometries, in Phys. Rev. B, 90, 045413-045413.
Structure factor of interacting one-dimensional helical systems
Gangadharaiah Suhas, Schmidt Thomas L., Loss Daniel (2014), Structure factor of interacting one-dimensional helical systems, in Phys. Rev. B, 89, 035131-035131.
Finite-temperature conductance of interacting quantum wires with Rashba spin-orbit coupling
Schmidt Thomas L. (2013), Finite-temperature conductance of interacting quantum wires with Rashba spin-orbit coupling, in Phys. Rev. B, 88, 235429-235429.
Majorana Qubit Rotations in Microwave Cavities
Schmidt Thomas L., Nunnenkamp Andreas, Bruder Christoph (2013), Majorana Qubit Rotations in Microwave Cavities, in Phys. Rev. Lett., 110, 107006-107006.
Microwave-controlled coupling of Majorana bound states
Schmidt Thomas L., Nunnenkamp Andreas, Bruder Christoph (2013), Microwave-controlled coupling of Majorana bound states, in New J. Phys., 15(2), 025043-025043.
Point contacts and localization in generic helical liquids
Orth Christoph P., Strübi Grégory, Schmidt Thomas L. (2013), Point contacts and localization in generic helical liquids, in Phys. Rev. B, 88, 165315-165315.
Strongly correlated dynamics in multichannel quantum {RC} circuits
Dutt Prasenjit, Schmidt Thomas L., Mora Christophe, Le Hur Karyn (2013), Strongly correlated dynamics in multichannel quantum {RC} circuits, in Phys. Rev. B, 87, 155134-155134.
Transport properties of double quantum dots with electron-phonon coupling
Walter Stefan, Trauzettel Björn, Schmidt Thomas L. (2013), Transport properties of double quantum dots with electron-phonon coupling, in Phys. Rev. B, 88, 195425-195425.
Finite-frequency noise properties of the nonequilibrium Anderson impurity model
Orth Christoph P., Urban Daniel F., Komnik Andreas (2012), Finite-frequency noise properties of the nonequilibrium Anderson impurity model, in Phys. Rev. B, 86, 125324-125324.
Inelastic Electron Backscattering in a Generic Helical Edge Channel
Schmidt Thomas L., Rachel Stephan, von Oppen Felix, Glazman Leonid I. (2012), Inelastic Electron Backscattering in a Generic Helical Edge Channel, in Phys. Rev. Lett., 108, 156402-156402.
One-dimensional quantum liquids: Beyond the Luttinger liquid paradigm
Imambekov Adilet, Schmidt Thomas L., Glazman Leonid I. (2012), One-dimensional quantum liquids: Beyond the Luttinger liquid paradigm, in Rev. Mod. Phys., 84(3), 1253-1253.
Rydberg crystallization detection by statistical means
Breyel D., Schmidt T. L., Komnik A. (2012), Rydberg crystallization detection by statistical means, in Phys. Rev. A, 86(2), 023405-023405.

Collaboration

Group / person Country
Types of collaboration
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

Scientific events

Active participation

Title Type of contribution Title of article or contribution Date Place Persons involved
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;


Abstract

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.
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