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Quantum coherence, quantum statistics, and superconductivity in mesoscopic systems

English title Quantum coherence, quantum statistics, and superconductivity in mesoscopic systems
Applicant Bruder Christoph
Number 155933
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 01.10.2014 - 30.09.2017
Approved amount 497'248.00
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Keywords (5)

ultracold atoms; nanomechanics; quantum coherence; condensed-matter theory; mesoscopic superconductivity

Lay Summary (German)

Lead
Mesoskopische Quantensysteme werden weltweit in vielenForschungsgruppen untersucht. Diese Systeme sind grössenmässigzwischen der mikroskopischen Welt einzelner Atome undElementarteilchen und unserer Alltagswelt angesiedelt. Wiruntersuchen Quanteneffekte in solchen Systemen mit theoretischenMethoden. Einerseits führt diese Forschung zu neuem Grundlagenwissen,wie z.B. der Physik von neuartigen Anregungszuständen, die sich wieihre eigenen Antiteilchen verhalten (sog. Majorana-Quasiteilchen).Andrerseits gewinnen wir Erkenntnisse über die Möglichkeiten undGrenzen von Quanten-Messungen, die zu Anwendungen führen könnten.
Lay summary
Unsere theoretische Forschungsgruppe (etwa drei Doktoranden und drei
Postdocs) untersucht konkret die Wechselwirkung von kleinen
mechanischen Schwingern mit elektrischen Strömen und mit Licht.
Wir arbeiten ebenfalls am Verständnis von Schwankungserscheinungen in
elektrischen Strömen. Ausserdem studieren wir Quanten-Modellsysteme,
die aus einer kleinen Zahl von supraleitenden Quanten-Bits, den
Bausteinen eines Quantencomputers, bestehen.  Und schliesslich
beschäftigen wir uns mit Supraleitung, einem makroskopischen
Quantenphänomen: hier geht es um den Nachweis von quantenmechanischer
Verschränkung von Elektronenpaaren, die aus einem Supraleiter
extrahiert werden.
Direct link to Lay Summary Last update: 29.09.2017

Responsible applicant and co-applicants

Employees

Publications

Publication
Fragmented superradiance of a Bose-Einstein condensate in an optical cavity
Lode A.U.J., Bruder C. (2017), Fragmented superradiance of a Bose-Einstein condensate in an optical cavity, in Phys. Rev. Lett., 118, 013603-013603.
Missing Shapiro steps and the 8 pi-periodic Josephson effect in interacting helical electron systems
Pedder Christopher J., Meng Tobias, Tiwari Rakesh P., Schmidt Thomas L. (2017), Missing Shapiro steps and the 8 pi-periodic Josephson effect in interacting helical electron systems, in PHYSICAL REVIEW B, 96(16), 165429.
Phantom vortices: hidden angular momentum in ultracold dilute Bose-Einstein condensates
Weiner S.E., Tsatsos M.C., Cederbaum L.S., Lode A.U.J. (2017), Phantom vortices: hidden angular momentum in ultracold dilute Bose-Einstein condensates, in Sci. Rep., 7, 40122-40122.
Quantum synchronization blockade: Energy quantization hinders synchronization of identical oscillators
Lörch N., Nigg S.E., Nunnenkamp A., Tiwari R.P., Bruder C. (2017), Quantum synchronization blockade: Energy quantization hinders synchronization of identical oscillators, in Phys. Rev. Lett., 118, 243602-243602.
Robust quantum optimizer with full connectivity
Nigg S.E., Lörch N., Tiwari R.P. (2017), Robust quantum optimizer with full connectivity, in Sci. Adv., 3, 1602273-1602273.
Switchable valley filter based on a graphene p-n junction in a magnetic field
Sekera T., Bruder C., Mele E. J., Tiwari R. P. (2017), Switchable valley filter based on a graphene p-n junction in a magnetic field, in PHYSICAL REVIEW B, 95(20), 205431.
Synchronization of an optomechanical system to an external drive
Amitai E., Lörch N., Nunnenkamp A., Walter S., Bruder C. (2017), Synchronization of an optomechanical system to an external drive, in Phys. Rev. A, 95, 053858-053858.
Towards a heralded eigenstate-preserving measurement of multi-qubit parity in circuit QED
Huembeli P., Nigg S.E. (2017), Towards a heralded eigenstate-preserving measurement of multi-qubit parity in circuit QED, in Phys. Rev. A, 96, 012313-012313.
Dynamic response functions and helical gaps in interacting Rashba nanowires with and without magnetic fields
Pedder Christopher J., Meng Tobias, Tiwari Rakesh P., Schmidt Thomas L. (2016), Dynamic response functions and helical gaps in interacting Rashba nanowires with and without magnetic fields, in PHYSICAL REVIEW B, 94(24), 245414.
Dynamics of Hubbard Hamiltonians with the multiconfigurational time-dependent Hartree method for indistinguishable particles
Lode Axel U. J., Bruder Christoph (2016), Dynamics of Hubbard Hamiltonians with the multiconfigurational time-dependent Hartree method for indistinguishable particles, in PHYSICAL REVIEW A, 94(1), 013616.
Genuine Quantum Signatures in Synchronization of Anharmonic Self-Oscillators
Lörch Niels, Amitai Ehud, Nunnenkamp Andreas, Bruder Christoph (2016), Genuine Quantum Signatures in Synchronization of Anharmonic Self-Oscillators, in PHYSICAL REVIEW LETTERS, 117(7), 073601.
Intrinsic Anomalous Hall Effect in Type-II Weyl Semimetals
Zyuzin A. A., Tiwari R. P. (2016), Intrinsic Anomalous Hall Effect in Type-II Weyl Semimetals, in JETP LETTERS, 103(11), 717-722.
Multiconfigurational time-dependent Hartree method for bosons with internal degrees of freedom: Theory and composite fragmentation of multicomponent Bose-Einstein condensates
Lode Axel U. J. (2016), Multiconfigurational time-dependent Hartree method for bosons with internal degrees of freedom: Theory and composite fragmentation of multicomponent Bose-Einstein condensates, in PHYSICAL REVIEW A, 93(6), 063601.
Multiconfigurational time-dependent Hartree method for fermions: Implementation, exactness, and few-fermion tunneling to open space
Fasshauer Elke, Lode Axel U. J. (2016), Multiconfigurational time-dependent Hartree method for fermions: Implementation, exactness, and few-fermion tunneling to open space, in PHYSICAL REVIEW A, 93(3), 033635.
Nonlocal quantum state engineering with the Cooper pair splitter beyond the Coulomb blockade regime
Amitai Ehud, Tiwari Rakesh P., Walter Stefan, Schmidt Thomas L., Nigg Simon E. (2016), Nonlocal quantum state engineering with the Cooper pair splitter beyond the Coulomb blockade regime, in PHYSICAL REVIEW B, 93(7), 075421.
Optomechanical self-oscillations in an anharmonic potential: engineering a nonclassical steady state
Grimm M., Bruder C., Lörch N. (2016), Optomechanical self-oscillations in an anharmonic potential: engineering a nonclassical steady state, in J. of Optics, 18, 094004-094004.
The topological Anderson insulator phase in the Kane-Mele model
Orth Christoph P., Sekera Tibor, Bruder Christoph, Schmidt Thomas L. (2016), The topological Anderson insulator phase in the Kane-Mele model, in SCIENTIFIC REPORTS, 6, 24007.
Thermoelectricity in a junction between interacting cold atomic Fermi gasese
Sekera Tibor, Bruder Christoph, Belzig Wolfgang (2016), Thermoelectricity in a junction between interacting cold atomic Fermi gasese, in PHYSICAL REVIEW A, 94(3), 033618.
Detecting nonlocal Cooper pair entanglement by optical Bell inequality violation
Nigg Simon E., Tiwari Rakesh P., Walter Stefan, Schmidt Thomas L. (2015), Detecting nonlocal Cooper pair entanglement by optical Bell inequality violation, in PHYSICAL REVIEW B, 91(9), 094516.
Full counting statistics of Majorana interferometers
Strübi Gregory, Belzig Wolfgang, Schmidt Thomas L., Bruder Christoph (2015), Full counting statistics of Majorana interferometers, in PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES, 74, 489-495.
Josephson response of a conventional and a noncentrosymmetric superconductor coupled via a double quantum dot
Sothmann Bjoern, Tiwari Rakesh P. (2015), Josephson response of a conventional and a noncentrosymmetric superconductor coupled via a double quantum dot, in PHYSICAL REVIEW B, 92(1), 014504.
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 PHYSICAL REVIEW B, 91(8), 081406.
Snake states and their symmetries in graphene
Liu Yang, Tiwari Rakesh P., Brada Matej, Bruder C., Kusmartsev F. V., Mele E. J. (2015), Snake states and their symmetries in graphene, in Phys. Rev. B, 92, 235438-235438.
Neutral edge modes in a superconductor-topological-insulator hybrid structure in a perpendicular magnetic field
Tiwari Rakesh P., Zülicke U., Bruder C., Stojanovic Vladimir M. (2014), Neutral edge modes in a superconductor-topological-insulator hybrid structure in a perpendicular magnetic field, in EPL, 108(1), 17009.

Collaboration

Group / person Country
Types of collaboration
Prof. T.L. Schmidt, Université de Luxembourg Luxembourg (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
Prof. D.V. Averin, University of Stony Brook United States of America (North America)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
Prof. W. Belzig, Universität Konstanz Germany (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
Dr. A. Nunnenkamp, Cambridge University Great Britain and Northern Ireland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
Prof. U. Zülicke, Victoria University of Wellington New Zealand (Oceania)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
Prof. Mahn-Soo Choi, Korea University Korean Republic (South Korea) (Asia)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
Prof. E.J. Mele, University of Pennsylvania United States of America (North America)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
Prof. R. Fazio, Scuola Normale Superiore Pisa Italy (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication

Scientific events

Active participation

Title Type of contribution Title of article or contribution Date Place Persons involved
Graphene 2017 Poster Switchable valley filter based on a graphene p-n junction in a magnetic field 28.03.2017 Barcelona, Spain Sekera Tibor;
DPG Frühjahrstagung (Spring Meeting) 2017 Talk given at a conference Switchable valley filter based on a graphene p-n junction in a magnetic field 19.03.2017 Dresden, Germany Sekera Tibor;
5th Conference on Nuclei and Mesoscopic Physics NMP17 Talk given at a conference Quantum synchronization 06.03.2017 East Lansing, United States of America Bruder Christoph;
Frontiers of Nanomechanical Systems 2017 Talk given at a conference Quantum synchronization 05.02.2017 La Thuile, Italy Bruder Christoph;
QSIT general meeting 2017 Talk given at a conference Robust quantum optimizer with full connectivity 01.02.2017 Arosa, Switzerland Nigg Simon;
628th WE-Heraeus Seminar: Trends in Mesoscopic Superconductivity Talk given at a conference Snake states in graphene 15.11.2016 Bad Honnef, Germany Bruder Christoph;
628th WE-Heraeus Seminar: Trends in Mesoscopic Superconductivity Poster Thermoelectricity in a junction between interacting cold atomic Fermi gases 15.11.2016 Bad Honnef, Germany Sekera Tibor;
Trends in Theory of Correlated Materials Talk given at a conference Snake states and their symmetries in graphene 23.05.2016 Villigen, Switzerland Tiwari Rakesh;
International Conference on Many-body Physics in Synthetic Quantum Systems Talk given at a conference Angular momentum in interacting many-body systems hides in phantom vortices 06.04.2016 Stellenbosch, South Africa Lode Axel Ulrich;
March meeting of the American Physical Society Talk given at a conference Snake states and their symmetries in graphene 16.03.2016 Baltimore, United States of America Tiwari Rakesh;
The 19th Symposium on Condensed Matter Physics (SFKM 2015) Talk given at a conference Quantum synchronization 07.09.2015 Belgrade, Serbien Bruder Christoph;
DPG Frühjahrstagung (Spring Meeting) 2015 Talk given at a conference Josephson response between a conventional and noncentrosymmetric superconductors 18.03.2015 Berlin, Germany Tiwari Rakesh;
QSIT general meeting 2015 Talk given at a conference Beyond Mean-Field Dynamics of Ultracold Bosonic Atoms 08.01.2015 Arosa, Switzerland Lode Axel Ulrich;
Invited seminar Individual talk Entanglement in Cooper Pair Splitters 13.11.2014 Konstanz, Germany Tiwari Rakesh;
Invited seminar Individual talk Entanglement in Cooper Pair Splitters 06.11.2014 Edinburgh, Great Britain and Northern Ireland Tiwari Rakesh;


Associated projects

Number Title Start Funding scheme
175596 Quantum coherence, quantum statistics, and superconductivity in mesoscopic systems 01.10.2017 Project funding (Div. I-III)
137551 Quantum coherence, quantum statistics, and superconductivity in mesoscopic systems 01.10.2011 Project funding (Div. I-III)
126637 Quantum coherence, quantum statistics, and superconductivity in mesoscopic systems 01.10.2009 Project funding (Div. I-III)

Abstract

A. Quantum coherence and statistics of mesoscopic systems:To access finite-frequency noise is experimentally difficult, since it requires a precise control of the measurement circuit at high frequencies. We will study the perspectives of a suspended nanomechanical device as a detector of frequency-dependent quantum noise. Motivated by recent breakthrough transport experiments with ultracold neutral atoms, we will also investigate theoretical proposals related to this setup, like time-dependent transport, drag experiments, noise and cross-correlation experiments. We would like to understand whether it is possible to do experiments known from non-equilibrium superconductivity (like charge imbalance or an enhancement of the superconducting orderparameter) by creating a non-equilibrium distribution of quasiparticles. Finally, we will find memory functions corresponding to particular operator orderings in a physical measurement setup.B. Mesoscopic superconductivity:We will calculate the full counting statistics (FCS) of interferometric structures that have arms containing Majorana quasiparticles and will link our results to recent FCS work that was related to localized Majorana excitations. In addition, we will show that a superconducting beam splitter embedded in a microwave cavity can be used to obtain information about the bulk order parameter of unconventional and non-centrosymmetric superconductors. Finally, we will study systems with a small number of superconducting qubits. For interacting quantum bits, external control of a single qubit may be sufficient to generate an arbitrary unitary transformations on a multi-qubit system. We will apply this idea to asimple bit-flip error correction algorithm that can be implemented as a unitary gate on a 5-qubit system.
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