Department of Applied Physics

Quantum Computing and Devices (QCD)

The Quantum Computing and Devices (QCD) group was formally established in October 2007, and since 2012, the premises of our research group has been referred to as QCD Labs. We keep an open mind and explore the most interesting and promising pathways to reach maximal quality and productivity in our research and innovations.
From left: Mikko Möttönen, doctoral student Arto Viitanen, and Valtteri Lahtinen, who recently launched the Quanscient startup. Photo: Mikko Raskinen.
From left: Mikko Möttönen, doctoral student Arto Viitanen, and Valtteri Lahtinen, who recently launched the Quanscient startup. Photo: Mikko Raskinen.

Mikko Möttönen and his team aim to rein in qubit errors

Professor Mikko Möttönen of Aalto University and VTT has received a €2.5 million ERC Advanced Grant from the European Research Council for the ConceptQ project.

(Aalto news)

We have a major effort on experimental quantum physics with superconducting circuits, but we also carry out computational and theoretical work down to fundamental quantum mechanics. Currently, we focus on control and readout techniques for superconducting qubits and on the implementation of on-demand dissipation in quantum circuits to study the related dynamics of open quantum systems. 
We also develop ultrasensitive microwave detectors and on-chip components for controlling microwave photons, single-electron pumps based on silicon quantum dots, and quantum knots and monopoles in Bose-Einstein condensates. We are also proud to have given birth to a leading European quantum-computer company IQM. Recently, we jointly developed with IQM an open-source software, KQCircuits, to design superconducting quantum processors, making our tools available for the entire quantum community (more information here).

We are looking for postdocs and PhD students for experiments on superconducting quantum electronic circuits

Requirements for postdocs:
Successful experience on measurements or fabrication of high-coherence superconducting resonators or qubits

Requirements for Ph.D students:
Outstanding performance in BSc and MSc studies on an applicable field (GPA 4.5/5.0 or greater)

If you fulfill the requirements, please apply by sending your CV, list of publications, and a short cover letter expressing your interests and greatest merits to Mikko ([email protected])

Mikko Möttönen

Group leader

Dr. Mikko Möttönen

Mikko's Quantum Blog

Research

Research highlight: 

NATURE PUBLICATION: Bolometer operating at the threshold for circuit quantum electrodynamics,
Nature 586, 47–51 (2020).

SCIENCE PUBLICATION: Observation of isolated monopoles in a quantum field,
Science 348, 544 (2015).

Bolometers used for qubit readout

Ultrasensitive bolometers

We develop fast and sensitive thermal detectors for circuit quantum electrodynamics applications.

Department of Applied Physics
Artistic depiction of a bright light in space / made by Ray Scipak

Quantum gases

Bose-Einstein condensation (BEC) is a manifestation of macroscopic occupation of a single quantum state.

Department of Applied Physics
Six superconducting qubits sample

Superconducting quantum electronics

We develop components and methodology in the rapidly growing field of quantum computing, especially in the framework of circuit quantum electrodynamics (cQED).

Department of Applied Physics
Quantum theory

Quantum theory

QCD's activities cover theoretical and computational problems in quantum information science as well as experimental realizations of quantum devices.

Department of Applied Physics
Silicon quantum electronics

Silicon quantum electronics

Our rigorous long term goal is to find a high-yield (100 pA) and metrologically accurate (10 ppb uncertainty) current source which could be used to redefine the unit of electric current, the ampere.

Department of Applied Physics

QCD Media Room

Media hits and research videos by the QCD group

QCD Cinema

Research presentations and media interviews on the research by the QCD group

QCD Media

QCD research in the media

Facilities

The samples are fabricated in Micronova cleanroom facilities.

Computational studies are performed utilizing the resources of Aalto University and CSC.

Micro and nanofabrication facilities

OtaNano offers facilities to develop innovative enabling technologies and apply them to practical micro- and nano-systems

Services
Cryostats and measurement equipment in QCD Labs

QCD Labs - Cryostats and measurement equipment

Cryostats and measurement equipment used in QCD Labs.

Department of Applied Physics

Latest publications

Single-domain Bose condensate magnetometer achieves energy resolution per bandwidth below ħ

Silvana Palacios Alvarez, Pau Gomez, Simon Coop, Roberto Zamora-Zamora, Chiara Mazzinghi, Morgan W. Mitchell 2022 Proceedings of the National Academy of Sciences of the United States of America

Charge ambiguity and splitting of monopoles

Toni Annala, Mikko Möttönen 2022 PHYSICAL REVIEW RESEARCH

Radio-Frequency Coulomb-Blockade Thermometry

Florian Blanchet, Yu Cheng Chang, Bayan Karimi, Joonas T. Peltonen, Jukka P. Pekola 2022 Physical Review Applied

Microwave response of a metallic superconductor subject to a high-voltage gate electrode

Giacomo Catto, Wei Liu, Suman Kundu, Valtteri Lahtinen, Visa Vesterinen, Mikko Möttönen 2022 Scientific Reports

Thin-shell approach for modeling superconducting tapes in the H-φ finite-element formulation

Bruno De Sousa Alves, Valtteri Lahtinen, Marc Laforest, Frédéric Sirois 2022 Superconductor Science and Technology

Recent Developments in Quantum-Circuit Refrigeration

Timm Fabian Mörstedt, Arto Viitanen, Vasilii Vadimov, Vasilii Sevriuk, Matti Partanen, Eric Hyyppä, Gianluigi Catelani, Matti Silveri, Kuan Yen Tan, Mikko Möttönen 2022 Annalen der Physik

Assessment of weak-coupling approximations on a driven two-level system under dissipation

W. S. Teixeira, F. L. Semiao, J. Tuorila, M. Mottonen 2022 New Journal of Physics

Single-junction quantum-circuit refrigerator

V. Vadimov, A. Viitanen, T. Mörstedt, T. Ala-Nissila, M. Möttönen 2022 AIP ADVANCES

A low-noise on-chip coherent microwave source

Chengyu Yan, Juha Hassel, Visa Vesterinen, Jinli Zhang, Joni Ikonen, Leif Grönberg, Jan Goetz, Mikko Möttönen 2021 Nature Electronics

Photon-number-dependent effective Lamb shift

Arto Viitanen, Matti Silveri, Mate Jenei, Vasilii Sevriuk, Kuan Y. Tan, Matti Partanen, Jan Goetz, Leif Gronberg, Vasilii Vadimov, Valtteri Lahtinen, Mikko Mottonen 2021 PHYSICAL REVIEW RESEARCH
More information on our research in the Research database.
Research database
QCD group 2022
QCD group members 2022

QCD members in the group photo 2022 (from the left): Jian Ma, Wallace Santos Teixeira, Heidi Kivijärvi, Ron Nyström, Qiming Chen, Roberto Zamora-Zamora, Florian Blanchet, Tommi Malmelin, Sasu Tuohino, Mikko Möttönen, Algot Silvennoinen, Heikki Suominen, Arman Alizadeh, Timm Mörstedt, Arto Viitanen, Aarne Keränen, Andras Gunyho, Joonas Vuojamo, Vasilii Vadimov, Hermanni Rajamäki, Louis Lattier, Toni Annala, Miika Rasola

Sakari Niemelä, Daniel de Carvalho, Aashish Sah, Suman Kundu, Manuela Norrgrann, Maaria Tiiri, Priyank Singh, Giacomo Catto

Research group members

Arman Alizadeh

Postdoctoral Researcher

Toni Annala

Postdoctoral Researcher

Florian Blanchet

Postdoctoral Researcher

Giacomo Catto

Doctoral Candidate

Rostislav Duda

Doctoral Candidate

Andras Marton Gunyho

Doctoral Candidate

Aarne Timo Tapio Keränen

Doctoral Candidate

Heidi Kivijärvi

Research Assistant

Suman Kundu

Postdoctoral Researcher

Valtteri Veli Lahtinen

Research Fellow

Wei Liu

Postdoctoral Researcher

Jian Ma

Postdoctoral Researcher

Timm Fabian Mörstedt

Doctoral Candidate
Mikko Möttönen

Mikko Möttönen

Associate Professor

Miika Rasola

Doctoral Candidate

Aashish Sah

Doctoral Candidate
T304 Dept. Applied Physics

Wallace Santos Teixeira

Postdoctoral Researcher

Priyank Singh

Postdoctoral Researcher

Kuan Tan

Academy Research Fellow

Sasu Tuohino

Doctoral Candidate

Vasilii Vadimov

Postdoctoral Researcher

Arto Viitanen

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