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Applied Quantum Physics
MC2 - Department of Microtechnology and Nanoscience
Chalmers University of Technology
S-412 96 Göteborg
Sweden
News....
News....
15th of November 2024
A really interesting week of lectures and scientific discussions is over!
Congratulations to Elsa, who won one of the two poster prizes!
4th of November 2024
Welcome Krishna! Krishna Lyn Delima starts as a master student in the group. She will work with Bruno on feedback in hot-carrier solar cells.
7th of October 2024
Welcome Nicolás! Nicolás Torres Dominguez is starting his PhD in the group and will work in the context of the NanoRecycle project.
2nd of September 2024
Welcome Rasmus! Rasmus Hagman starts as a Master student and will work with Henning on measurement-based engines.
21st of August 2024
Welcome Elsa and welcome (back) Didrik!! Elsa Danielsson and Didrik Palmqvist start as PhD students in the group and will work in the context of the NanoRecycle project.
3rd of June 2024
Congratulations Didrik, for a fantastic presentation of a very successful master project! The title of the presentation was "Bounds on entropy production and its noise in bosonic systems".
13th of March 2024
Welcome Thibault! Thibault Thuégaz starts as a Master student (from INP Grenoble) and will work on modeling of a multi-terminal hot-carrier solar cell.
6th of May 2024
Welcome Henning! Henning Kirchberg starts as a Postdoc in the group and will work on performance quantifiers for energy conversion in nanoscale devices.
3rd of May 2024
Fantastic news! Our article on "Non-equilibrium fluctuation-dissipation bounds has been published in PRL and highlighted as an Editor's suggestion!
2nd of April 2024
Welcome Bruno!! Bruno Bertin-Johannet started as a new postdoc in the group. He will work on thermodynamic aspects of time-dependent quantum transport.
11th of March 2024
Welcome Aymeric! Aymeric Frerejean starts as a Master student (from INP Grenoble) and will work on modeling of an optomechanical cavity with a Fano membrane.
15th of January 2024
Welcome Didrik! Didrik Palmqvist starts as a Master student and will work on noise bounds in bosonic systems.
6th of November 2023
Congratulations to Christian, who has been awarded a VR starting grant!!!
29th of August 2023
Congratulations to Sushanth Varada for a very successful master thesis defense today at Chalmers, with the title "Anyon Colliders: A time-dependent quantum Hall particle collider to reveal fractional statistics in the Laughlin sequence"
23rd of August 2023
Congratulations to Ludovico, who won the poster prize at the yearly workshop of the Nano Area of Advance at Chalmers!
2nd of August 2023
Warm welcome to Lei Du who starts as a postdoc in our group today! Lei will start working on a Wallenberg project on nonlinear optomechanics in collaboration between theory groups and the experimental group of Witlef Wieczorek.
21st of June 2023
Congratulations to Lara Ortmanns, who successfully defended her PhD today. The thesis was carried out in a cotutoring agreement between Chalmers and the RWTH Aachen in Germany and has the title: From 2d-van der Waals magnets to superconductor hybrid device.
4th of May 2023
Happy to announce that Janine was awarded an ERC consolidator grant! Looking forward to start the project NanoRecycle, dealing with energy conversion processes in nanoelectronic and hybrid devices!
1st November 2022:
Welcome Jens! Jens Schulenborg will work as a postdoc in the group during the coming months. He will focus on dynamics of strongly interacting quantum dots, exploiting a fermionic dissipative symmetry that we have previously discovered.
21st October 2022:
Congratulations!!!! Ludovico Tesser defended his Licenciate thesis Fluctuations and nonequilibrium thermodynamics in electronic nanosystems today. Patrick Potts from University of Basel was the opponent of the defense. The published thesis can be found here.
August 2022:
Our paper arXiv:2201.09553, a collaboration with the experimental group of Christian Glattli in Saclay, has now been accepted in Nature communications!
August 2022:
The News part of this homepage is finally up and running!
Recent Research Highlights
Recent Research Highlights
Out-of-Equilibrium Fluctuation-Dissipation Bounds
Out-of-Equilibrium Fluctuation-Dissipation Bounds
Ludovico Tesser, Janine Splettstoesser
We prove a general inequality between the charge current and its fluctuations valid for any non-interacting coherent electronic conductor and for any stationary out-of-equilibrium condition, thereby going beyond established fluctuation-dissipation relations. The developed fluctuation-dissipation bound saturates at large temperature bias and reveals additional insight for heat engines, since it limits the output power by power fluctuations. It is valid when the thermodynamic uncertainty relations break down due to quantum effects and provides stronger constraints close to thermovoltage.
Phys. Rev. Lett. 132, 186304 (2024)
(Highlighted as Editor's suggestion)
Two-particle time-domain interferometry in the fractional quantum Hall effect regime.
Two-particle time-domain interferometry in the fractional quantum Hall effect regime.
I. Taktak, M. Kapfer, J. Nath, P. Roulleau, M. Acciai, J. Splettstoesser, I. Farrer, D. A. Ritchie, D. C. Glattli
Quasi-particles are elementary excitations of condensed matter quantum phases. Demonstrating that they keep quantum coherence while propagating is a fundamental issue for their manipulation for quantum information tasks. Here, we consider anyons, the fractionally charged quasi-particles of the Fractional Quantum Hall Effect occurring in two-dimensional electronic conductors in high magnetic fields. They obey anyonic statistics, intermediate between fermionic and bosonic. Surprisingly, anyons show large quantum coherence when transmitted through the localized states of electronic Fabry-Pérot interferometers, but almost no quantum interference when transmitted via the propagating states of Mach-Zehnder interferometers. Here, using a novel interferometric approach, we demonstrate that anyons do keep quantum coherence while propagating. Performing two-particle time-domain interference measurements sensitive to the two-particle Hanbury Brown Twiss phase, we find 53 and 60% visibilities for anyons with charges e/5 and e/3. Our results give a positive message for the challenge of performing controlled quantum coherent braiding of anyons.
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