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.
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
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
You can find more information in german on the TU Wien website Presseaussendung
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.
Sept 15, 2008
Our proposal for "Strong magnetic coupling of an ultracold gas to a superconducting waveguide cavity" appeared on the arXiv
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
- Quantum Computing
This paper explains in lay-mans terms the working principle of a quantum computer and the state-of-the-art of qubit research.
SEV Bulletin, , 5 (2009), electrosuisse (Swiss association for electrical engineering, power and information technologies)
- 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),
- 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),
- 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),
- 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),
- 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
- 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
- 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.