Johannes Majer

Picture of Johannes Majer

Welcome to my webpage. Currently I am leading an effort in hybrid quantum systems aiming at combining superconducting circuits and spins. The lab is part of the Division of Quantum Physics and Quantum Information at the University of Science and Technology of China.

Growing up in Switzerland, I studied physics at the federal institue of technology in Zurich (ETHZ) and received my diploma in 1997. Then I moved to the Netherlands and worked the TUDelft under the supervision of Hans Mooij. I received my PhD in 2002 with the thesis "Superconducting Quantum Circuits". After that I moved to the United States where I joined the group of Rob Schoelkopf at Yale. We studied superconducting quantum bits and their coupling to a cavity which lead to the new field of circuit QED.

Contact Information

Prof. Dr. Johannes Majer
Xiupu Road 99
University of Science and Technology
Shanghai Research Institute
Pudong New District

201315, Shanghai

P. R. China

Email: johannes [at] majer [dot] ch

Recent News

January, 2020

In 2020 I started a new lab at the Division of Quantum Physics and Quantum Information of the University of Science and Technology of China. If you interested in joining the lab, please contact me.

September 4th, 2018

We measured superradiance with our hybrid system. The article has just appeared in Nature Physics:

Superradiant emission from colour centres in diamond
Andreas Angerer, Kirill Streltsov, Thomas Astner, Stefan Putz, Hitoshi Sumiya, Shinobu Onoda, Junichi Isoya, William J. Munro, Kae Nemoto, Jörg Schmiedmayer & Johannes Majer

Please refer to the press release of the TU Wien

Check out the coverage at, der Standard

February 12th, 2018

Solid-state electron spin lifetime limited by phononic vacuum modes
T. Astner, J. Gugler, A. Angerer, S. Wald, S. Putz, N. J. Mauser, M. Trupke, H. Sumiya, S. Onoda, J. Isoya, J. Schmiedmayer, P. Mohn & J. Majer
Nature Materials 17, 313–317 (2018)

December 8th, 2017

Ultralong relaxation times in bistable hybrid quantum systems
Andreas Angerer, Stefan Putz, Dmitry O. Krimer, Thomas Astner, Matthias Zens, Ralph Glattauer, Kirill Streltsov, William J. Munro, Kae Nemoto, Stefan Rotter, Jörg Schmiedmayer, and Johannes Majer
Science Advances 3, (2017)
DOI: 10.1126/sciadv.1701626

April 10, 2017

We managed to couple two distant diamonds with a superconducting cavity. The work is published in Physical Review Letters and is chosen as an "Editor's Suggestion"
Coherent Coupling of Remote Spin Ensembles via a Cavity Bus
T. Astner, S. Nevlacsil, N. Peterschofsky, A. Angerer, S. Rotter, S. Putz, J. Schmiedmayer, and J. Majer
Phys. Rev. Lett. 118, 140502 (2017)

You find more information and an explenation for a general audience on the TU Wien Homepage, in German and in English (Photo: Thomas Srdinko)

November 21, 2016

Our work on the "Spectral hole burning and its application in microwave photonics" has now appeared in Nature Photonics:
Spectral hole burning and its application in microwave photonics
Stefan Putz, Andreas Angerer, Dmitry O. Krimer, Ralph Glattauer, William J. Munro, Stefan Rotter, Jörg Schmiedmayer, Johannes Majer
Nature Photonics 11, 36–39 (2017)

You find more information on the TU Wien Homepage.

July 21, 2016

We have demonstrade a novel cavity with homogenous coupling:
Collective strong coupling with homogeneous Rabi frequencies using a 3D lumped element microwave resonator
Andreas Angerer, , Thomas Astner, Daniel Wirtitsch, Hitoshi Sumiya, Shinobu Onoda, Junichi Isoya, Stefan Putz, and Johannes Majer
Appl. Phys. Lett. 109, 033508 (2016)

November 12, 2015

Smooth Optimal Quantum Control for Robust Solid-State Spin Magnetometry
Tobias Nöbauer, Andreas Angerer, Bj\"orn Bartels, Michael Trupke, Stefan Rotter, J\"org Schmiedmayer, Florian Mintert, and Johannes Majer
Phys. Rev. Lett. 115, 190801 (2015)

You find more information on the TU Wien Homepage.

August 18, 2014

Today our work on the cavity protection effect has been published in Nature Physics:
Protecting a spin ensemble against decoherence in the strong-coupling regime of cavity QED, S. Putz, D. O. Krimer, R. Amsüss, A. Valookaran, T. Nöbauer, J. Schmiedmayer, S. Rotter, J. Majer, Nature Physics (2014) doi:10.1038/nphys3050

Also see the News and Views article by Klaus Molmer Quantum memory: Needle in a haystack

You find more information on the TU Wien Homepage. "Cavity Protection Effect" macht Quanteninformation langlebig

July 10, 2014

Our recent proposal for realizing a Dicke lattice model in hybrid quantum system has been published in PRL.
Phys. Rev. Lett. 113, 023603

June 4, 2012

PhD position available: There is a PhD position within the Solids4Fun doctoral program available.

May 2, 2012

Our paper on "Strong magnetic coupling of an inhomogeneous nitrogen-vacancy ensemble to a cavity" has been published in Physical Review A: Phys. Rev. A 85, 053806 (2012)

August 8, 2011

Our paper on "Cavity QED with Magnetically Coupled Collective Spin States" has been published in Physical Review Letters: Phys. Rev. Lett. 107, 060502 (2011)
You can find more information in german on the TU Wien Presseaussendung.
Sample Team2 Team

April 20, 2011

I have received a TOP research grant from the TU Wien:
TU setzt neue Impulse für Spitzenforschung

June 29, 2009

Our article "Demonstration of two-qubit algorithms with a superconducting quantum processor" appeared online in Nature. Two Qubit Chip
You can find more information in german on the TU Wien website Presseaussendung.

May, 2009

I wrote an article for a general audience in german which appeared in the SEV Bulletin. The SEV Bulleting is the official publication of the electrosuisse, which is the Swiss association for electrical engineering, power and information technologies.
Quantum Computing.pdf.

Sept 15, 2008

Our proposal for "Strong magnetic coupling of an ultracold gas to a superconducting waveguide cavity" appeared on the arXiv arXiv:0809.2552.

Sept 26, 2007

Nature Cover Cavity Bus The cavity bus paper has appeared in this weeks issue of nature and is featured on the cover.

Sept 19, 2007

Single Photon Our article on the the generation of single microwave photons is published in this weeks issue of Nature Magazin. For more information please refere to the Schoelkopf Lab Webpage.

Sept 13, 2007

Our work on coupling qubits via the cavity bus is now available on the arXive.

Publications List

Check out my Google Scholar Profile, ResearcherID,

PhD Thesis

Thesis Johannes Majer Cover
Superconducting Quantum Circuits
Johannes B. Majer
ISBN 90-407-2360-5
Published by Delft University Press.

You can download my thesis from a dedicated website which also contains some additional online material. My thesis can also be purchased from Amazon or Barnes & Noble.