Quantum Nanoelectronics Seminars

All the "Quantum Nanoelectronics Seminars" past and future in this section.

The next seminar will be held on :
Tuesday 27 February 2018 at 2pm, room « Remy Lemaire » (K223), Institut Néel
Mandatory registration


Nanowire-based structures for applications in quantum information processing
Thomas Schäpers (Peter Grünberg Institute (PGI-9), Forschungszentrum Jülich, Germany)

Nanowires are not only interesting as building blocks for future nanoelectronic device applications they are also very promising candidates for realizing circuits for quantum information processing. Here, two major directions can be identified. First, nanowires can be employed to create Majorana fermions for robust topological quantum computing. One essential prerequisite is the verification of spin helical transport. In quantum point contacts based on InAs nanowires we achieved ballistic transport with quantized conductance. At the last step a dip feature is observed which is attributed to the presence of helical states [1]. The emergence of this dip feature is explained in the framework of exchange interactions. Recently, our research towards topological quantum computation is extended by using nanowires based on topological insulators such as Bi2Te3 or Sb2Te3. As a second option for applications in quantum information, semiconductor nanowires are also interesting for gate-controlled Josephson junctions in transmon qubits. In order to optimize the junction performance, the InAs nanowire is covered in-situ by a superconducting Al or Nb shell. These junctions are subsequently integrated in a superconducting resonator circuit.
Work done in collaboration with : D. Grützmacher, Y. Günel, N. Güsken, A. R. Jalil, J. Kölzer, S. Heedt, M. Lepsa, G. Mussler, T. Rieger, D. Rosenbach, J. Schubert, P. Schüffelgen, S. Trellenkamp, Ch. Weyrich, P. Zellekens (Jülich), N. Traverso Ziani, F. Crepin, B. Trauzettel (University of Würzburg), F. W. Prost (University Duisburg-Essen), M. Weides, S. Schlör (KIT Karlsruhe).

[1] S. Heedt, N. T. Ziani, F. Crepin, W. Prost, S. Trellenkamp, J. Schubert, D. Grützmacher, B. Trauzettel, Th. Schäpers, Nature Physics, 13, 563 (2017). doi:10.1038/nphys4070

Contact : Thomas Schäpers

The organization committee,
M. Hocevar, B. Sacepe, R. Whitney, C. Groth

If you want to plan invitations, please contact us at the following address :
equipe-seminaires-nano@fondation-nanosciences.fr

Upcoming
6 March 2018
Erik Bakkers (Technische Universiteit Eindhoven)
13 March 2018
Ines Safi (Laboratoire de Physique des Solides, Orsay)

Past

2017

19 December 2017
Tailoring supercurrent confinement in graphene bilayer weak links by Romain Danneau (Karlsruhe Institute of Technology Germany)
4 December 2017
Photonic counterparts of Cooper pairs by Marcelo Franca Santos (Universidade Federal do Rio de Janeiro)
28 November 2017
Near-quantum-limited microwave amplification and nonreciprocal transmission using engineered mechanical dissipation by Alexey Feofanov (EPFL Lausanne)
14 November 2017
Electron Transfer between Quantum Dots by Tobias Krähenmann (ETH Zurich)
7 November 2017
The Josephson effect in semiconductor channels : From fundamental science to qubit applications by Attila Geresdi (QuTech & Kavli Institute of Nanoscience, Delft University of Technology)
17 October 2017
Superconducting microwave cavities as memories for modular quantum information processing by Wolfgang Pfaff (Yale University, USA)
10 October 2017
From single magnetic adatoms on superconductors to coupled spin chains
by Katharina Franke (Freie Universität Berlin)

26 September 2017
Revealing a quantum phase transition with a Kondo circuit by Zubair Iftikhar (SPEC, CEA)
19 September 2017
Tinkering with Majoranas by Anton Akhmerov (TU Delft)
11 July 2017
The role of electron-electron interactions in graphene by Shaffique Adam (National University of Singapore)
20 June 2017
Charge quantum interference device on superconducting nano-wiresby by Oleg Astafiev (Royal Holloway, University of London)
13 June 2017
Evolving functionality in nanomaterial networks by Wilfred G. van der Wiel (University of Twente, The Netherlands)
6 June 2017
Relaxation of an Electron Spin in a Moving Quantum Dotby Xuedong Hu (Department of Physics, University at Buffalo, USA)
30 May 2017
Understanding and exploiting interactions between components in quantum circuits by Philippe Joyez (SPEC, CEA-Saclay)
22 May 2017
Feedback-tuned high fidelity gates for (GaAs based) two-electron spin qubits by Hendrik Bluhm (RWTH Aachen University, Germany)
16 May 2017
Electron teleportation in multi-terminal Majorana islands : Kondo effect at high temperature by Karen Michaeli (Weizmann Institute for Science, Israel)
9 May 2017
Superconducting Atom Chips by Rainer Dumke (Nanyang Technological University, Singapore)
4 May 2017
Quantum Physics in One Dimension using Nanostructured Josephson-junction Arrays by Tim Duty (University of New South Wales, Sydney)
20 April 2017
Les bits quantiques MOS by Prof. Michel Pioro-Ladrière (Professeur associé, Département de physique, Université de Sherbrooke et Directeur adjoint, Institut Quantique, Université de Sherbrooke)
11 April 2017
Quantum microwave devices based on inelastic Cooper pair tunneling by Max Hofheinz (CEA INAC)
28 March 2017
Spin to charge conversion at room temperature using spin orbit coupling and recently discovered topological insulators by Laurent Vila (SPINTEC)
21 March 2017
Spin Dynamics in Out-of-Equilibrium Superconductors by Charis Quay (Laboratoires de Physique des Solides, Université Paris Sud)
14 March 2017
From CMOS transistors to CMOS spin qubits by Marc Sanquer (INAC/PHELIQS/LATEQS CEA & UGA)
14 February 2017
Quantized circular photogalvanic effect in Weyl semimetals by Adolfo Grushin (Department of Physics, UC Berkeley et Institut Néel, CNRS & UGA)
7 February 2017
Confining the state of light to a quantum manifold by engineered two-photon loss by Zaki Leghtas (Laboratoire Pierre Aigrain - Ecole Normale Supérieure)
31 January 2017
Many-Body Localization Basics - Recent Highlights - Experimental possibilities by Nicolas Laflorencie (Laboratoire de Physique Théorique, Toulouse)
24 January 2017
Fluctuation theorems in engineered environments by Marcelo F. Santos (Universidade Federal do Rio de Janeiro, Brazil)
17 January 2017
THz Spectroscopy on Disordered Superconductors and the “Superconducting Dome” of Granular Aluminum by Marc Scheffler (Physikalisches Institut, University of Stuttgart, Germany)
10 January 2017
Mesoscopic Spectroscopy with Josephson Junctions by Caglar GIRIT (Collège de France, Paris)

News

Agenda

Quantum Nanoelectronics Seminar : Erik Bakkers

mardi 6 mars 2018 - 14h00 - Room « Remy Lemaire » (K223)

Bottom-up grown nanowire quantum devices (...)

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Quantum Nanoelectronics Seminar : Thomas Schäpers

mardi 27 février 2018 - 14h00 - Room « Remy Lemaire » (K223)

Nanowire-based structures for applications in (...)

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Quantum Nanoelectronics Seminar : Ines Safi

mardi 13 mars 2018 - 14h00 - Room « Remy Lemaire » (K223)

Ines Safi (Laboratoire de Physique des (...)

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Seminar Josep Puigmartí-Luis

mercredi 28 février 2018 - 10h30 - Grenoble INP - Phelma

Engineering liquid-liquid interfacial (...)

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Calendar