Johannes Majer

Welcome to my webpage. Currently I am leading an effort aiming at combining superconducting and atomic qubits in the atomchip group at the Atominsitut, TU Vienna.

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

Dr. Johannes Majer
Atominstitut der Österreichischen Universitäten
TU Wien
Stadionallee 2
1020 Wien
Austria
Phone: +43 1 58801 141838
Cell: +43 699 1025 3808
Email: johannes [at] majer [dot] ch
AIM: johannesmajer
Skype:

Recent News

June 4, 2012

PhD position available: There is a PhD position within the Solids4Fun doctoral program available. http://solidfun.tuwien.ac.at

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.

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.
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

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

Sept 19, 2007

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

• Quantum Computing
  Johannes Majer
  SEV Bulletin, , 5 (2009), electrosuisse (Swiss association for electrical engineering, power and information technologies) Quantum Computing.pdf
This paper explains in lay-mans terms the working principle of a quantum computer and the state-of-the-art of qubit research.
• Reversible state transfer between superconducting qubits and atomic ensembles
  David Petrosyan, Guy Bensky, Gershon Kurizki, Igor Mazets, Johannes Majer, and Jorg Schmiedmayer
  Phys. Rev. A 79, 040304 (2009), 10.1103/PhysRevA.79.040304, arXiv:0902.0881.
• Suppressing charge noise decoherence in superconducting charge qubits
  J. A. Schreier, A. A. Houck, Jens Koch, D. I. Schuster, B. R. Johnson, J. M. Chow, J. M. Gambetta, J. Majer, L. Frunzio, M. H. Devoret, S. M. Girvin, and R. J. Schoelkopf
  Phys. Rev. B 77, 180502 (2008), 10.1103/PhysRevB.77.180502, arXiv:0712.3581.
• Charge-insensitive qubit design derived from the Cooper pair box
  Jens Koch, Terri M. Yu, Jay Gambetta, A. A. Houck, D. I. Schuster, J. Majer, Alexandre Blais, M. H. Devoret, S. M. Girvin, and R. J. Schoelkopf
  Phys. Rev. A 76, 042319 (2007), 10.1103/PhysRevA.76.042319, arXiv:cond-mat/0703002.
• Coupling Superconducting Qubits via a Cavity Bus
  J. Majer, J. M. Chow, J. M. Gambetta, Jens Koch, B. R. Johnson, J. A. Schreier, L. Frunzio, D. I. Schuster, A. A. Houck, A. Wallraff, A. Blais, M. H. Devoret, S. M. Girvin, and R. J. Schoelkopf
  Nature 449, 443-447 (2007), doi:10.1038/nature06184, arXiv:0709.2135.
• Introducing the Transmon: a new superconducting qubit from optimizing the Cooper Pair Box
  Jens Koch, Terri M. Yu, Jay Gambetta, A. A. Houck, D. I. Schuster, J. Majer, Alexandre Blais, M. H. Devoret, S. M. Girvin, R. J. Schoelkopf
  arXiv:cond-mat/0703002.
• Generating Single Microwave Photons in a Circuit
  A. A. Houck, D. I. Schuster, J. M. Gambetta, J. A. Schreier, B. R. Johnson, J. M. Chow J. Majer, L. Frunzio, M. H. Devoret, S. M. Girvin and R. J. Schoelkopf
  Nature 449, 328-331 (2007), doi:10.1038/nature06126, arXiv:cond-mat/0702648.
• Resolving photon number states in a superconducting circuit
  D. I. Schuster, A. A. Houck, J. A. Schreier, A. Wallraff, J. M. Gambetta, A. Blais, L. Frunzio, J. Majer, B. Johnson, M. H. Devoret, S. M. Girvin, R. J. Schoelkopf
  Nature 445, 515 - 518 (2007), doi:10.1038/nature05461, arXiv:cond-mat/0608693.
• Qubit-photon interactions in a cavity: Measurement-induced dephasing and number splitting
  Jay Gambetta, Alexandre Blais, D. I. Schuster, A. Wallraff, L. Frunzio, J. Majer, M. H. Devoret, S. M. Girvin, and R. J. Schoelkopf
  Phys. Rev. A 74, 042318 (2006), doi:10.1103/PhysRevA.74.042318, arXiv:cond-mat/0602322.
• Approaching Unit Visibility for Control of a Superconducting Qubit with Dispersive Readout
  A. Wallraff, D. I. Schuster, A. Blais, L. Frunzio, J. Majer, M. H. Devoret, S. M. Girvin, and R. J. Schoelkopf
  Phys. Rev. Lett. 95, 060501 (2005), doi:10.1103/PhysRevLett.95.060501, arXiv:cond-mat/0502645.
• AC Stark Shift and Dephasing of a Superconducting Qubit Strongly Coupled to a Cavity Field
  D. I. Schuster, A. Wallraff, A. Blais, L. Frunzio, R.-S. Huang, J. Majer, S. M. Girvin, and R. J. Schoelkopf
  Phys. Rev. Lett. 94, 123602 (2005), doi:10.1103/PhysRevLett.94.123602, arXiv:cond-mat/0408367.
• Backaction effects of a SSET measuring a qubit spectroscopy and ground State measurement
  B. Turek, J. Majer, A. Clerk, S. Girvin, A. Wallraff, K. Bladh, D. Gunnarsson, T. Duty, P. Delsing, R. J. Schoelkopf
  IEEE Transactions on Applied Superconductivity, 15, 880 - 883 (2005), doi:10.1109/TASC.2005.850096.
• Fabrication and characterization of superconducting circuit QED devices for quantum computation
  L. Frunzio, A. Wallraff, D. Schuster, J. Majer, R. Schoelkopf
  IEEE Transactions on Applied Superconductivity, 15, 860 - 863 (2005), doi: 10.1109/TASC.2005.850084, arXiv:cond-mat/0411708.
• Spectroscopy on two coupled flux qubits
  J. B. Majer, F. G. Paauw, A. C. J. ter Haar, C. J. P. M. Harmans, J. E. Mooij
  Phys. Rev. Lett. 94 , 090501 (2005), doi:10.1103/PhysRevLett.94.090501, arXiv:cond-mat/0308192.
• Strong coupling of a single photon to a superconducting qubit using circuit quantum electrodynamics
  A. Wallraff, D. I. Schuster, A. Blais, L. Frunzio, R.- S. Huang, J. Majer, S. Kumar, S. M. Girvin, R. J. Schoelkopf
  Nature 431, 162 (2004), doi:10.1038/nature02851, arXiv:cond-mat/0407325.
• Superconducting Quantum Circuits
  Johannes Majer
  PhD Thesis
• Quantum Ratchet Effect for Vortices
  J. B. Majer, J. Peguiron, M. Grifoni, M. Tusveld, and J. E. Mooij
  Phys. Rev. Lett. 90 , 056802 (2003), doi:10.1103/PhysRevLett.90.056802, arXiv:cond-mat/0308192.
• Quantum Ratchets with Few Bands below the Barrier
  M. Grifoni, M. S. Ferreira, J. Peguiron, and J. B. Majer
  Phys. Rev. Lett. 89 , 146801 (2002), doi:10.1103/PhysRevLett.89.146801, arXiv:cond-mat/0208549.
• Simple phase bias for superconducting circuits
  J. B. Majer, J. R. Butcher, and J. E. Mooij
  Appl. Phys. Lett. 80 , 3638 (2002), doi:10.1063/1.1478150, arXiv:cond-mat/0108266.

PhD Thesis

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.