Welcome to my home page!

Matthias Steffen

Research Staff Member – IBM Watson
(2006 – present)

 msteffe [at] us [dot] ibm [dot] com

Physics Postdoc - UCSB



About me

I received my PhD from Stanford University in June 2003 under the guidance of Prof. Isaac L. Chuang (now at MIT). My thesis focused on implementing quantum algorithms on a quantum computer using Nuclear Magnetic Resonance (NMR) techniques. I did my postdoctoral work in John Martinis’ group where we build quantum bits using Josephson junctions (phase qubits, to be precise). I am now working on flux qubits at the IBM Watson Research Center in Yorktown Heights, NY.


Please submit all requests for internships and other job openings at UC Santa Barbara directly to John Martinis! I do not know what’s available.


If you are curious about internships and other job opportunities at IBM, please be patient. I will post information soon.


Research Interests

·        Experimental Quantum Computing and Information (NMRQC, Superconducting QCs)

·        Josephson Junction physics

·        NMR techniques as they apply to QC



·        NMR Quantum Computing

My graduate research focused on NMR quantum computing. Learn everything about quantum computing (and NMRQC) by clicking the link above.

·        Qubits based on Josephson junctions

                        I now build qubits using Josephson junctions.




·   Implementation of a three-quantum-bit search algorithm


        Lieven M. K. Vandersypen, Matthias Steffen, Mark H. Sherwood, Costantino S. Yannoni, Gregory Breyta, and Isaac L. Chuang, Appl. Phys. Lett. 76 , 5, pp. 646-648 (2000).

      [Abstract] [PDF] [GZipped PS] [Journal Page]


·   Simultaneous Soft Pulses Applied at Nearby Frequencies


        Matthias Steffen, Lieven M. K. Vandersypen and Isaac L. Chuang

        J. Magn. Reson. 146 , 2, pp. 369-374 (2000).

      [Abstract] [PDF] [Journal Page]


·        Experimental Realization of an Order-Finding Algorithm with an NMR Quantum Computer

        Lieven M. K. Vandersypen, Matthias Steffen, Gregory Breyta, Costantino S. Yannoni, Richard Cleve, and Isaac L. Chuang

        Phys. Rev. Lett. 85 , 25, pp. 5452-5455 (2000).

      [Abstract] [PDF] [Journal Page]


·        NMR Implementation of a Building Block for Scalable Quantum Computation

        Darrick E. Chang, Lieven M.K. Vandersypen and Matthias Steffen

        Chem. Phys. Lett. 338 , pp. 337-344 (2001).

      [Abstract] [PDF] [GZipped PS]


·        Towards quantum computation: a five-qubit quantum processor

        Matthias Steffen, Lieven M.K. Vandersypen and Isaac L. Chuang

        IEEE Micro 21 , 2, pp. 24-34 (2001)

      [Abstract] [PDF]


·       Experimental realization of Shor's quantum factoring algorithm using nuclear magnetic resonance

        Lieven M.K. Vandersypen, Matthias Steffen, Gregory Breyta, Costantino S. Yannoni, Mark H. Sherwood, and Isaac L. Chuang

        Nature, 414 , pp. 883-887 (2001)

      [Abstract] [PDF]


·        Experimental implementation of an adiabatic quantum optimization algorithm

        Matthias Steffen, Wim van Dam, Tad Hogg, Greg Breyta, and Isaac Chuang

        Phys. Rev. Lett., 90, 067903 (2003)

[Abstract] [PDF]


·        Test by NMR of the Phase Coherence of Electromagnetically Induced Transparency

        K.V.R.M. Murali, Hyung-Bin Song, Matthias Steffen, Patrick Judeinstein, and Isaac L. Chuang

        Phys. Rev. Lett., 93, 033601 (2004)

[Abstract] [PDF]


·        NMR Quantum Information Processing

        Chandrasekhar Ramanathan, Nicolas Boulant, Zhiying Chen, David G. Cory, Isaac L. Chuang, and Matthias Steffen

        Quant. Inf. Proc., 4, 15-44 (2004)

[Abstract] [PDF]


·        PhD Thesis

        Matthias Steffen

        Stanford University  (2003)

[available upon request]


Superconducting Qubits



·        Accurate control of Josephson phase qubits

        Matthias Steffen, John M. Martinis, and Isaac L. Chuang

        Phys. Rev. B., 68, 224518 (2003)

[Abstract] [PDF]


·       Observation of Quantum Oscillations between a Josephson Phase Qubit and a Microscopic Resonator Using Fast Readout

        K.B. Cooper, Matthias Steffen, R. McDermott, R.W. Simmonds, Seongshik Oh, D.A. Hite, D.P. Pappas and John M. Martinis

        Phys. Rev. Lett., 93, 180401 (2004)

[Abstract] [PDF]


·       Josephson Junction materials research using phase qubits

        R.W. Simmonds, D.A. Hite, R. McDermott, M. Steffen, K.B. Cooper, K.M. Lang, J.M. Martinis, and D.P. Pappas

        To appear in "Quantum Computation: solid state systems" by P. Delsing, C. Granata, Y. Pashkin, B. Ruggiero and P. Silvestrini, December, 2004

[Abstract] [PDF]


·       Simultaneous State Measurement of Coupled Josephson Phase Qubits

        R. McDermott, R.W. Simmonds, Matthias Steffen, K.B. Cooper, K. Cicak, K.D. Osborn, Seongshik Oh, D.P. Pappas, John M. Martinis

        Science, 307, 1299-1302 (2005)

[Abstract] [PDF]


·       Decoherence in Josephson Qubits from Dielectric Loss

        John M. Martinis, K.B. Cooper, R. McDermott, Matthias Steffen, Markus Ansmann, K.D. Osborn, K. Cicak, Seongshik Oh, D.P. Pappas, R.W. Simmonds, and Clare Yu

        Phys. Rev. Lett., 95, 210503 (2005)



·       State Tomography of Capacitively Shunted Phase Qubits with High Fidelity

        Matthias Steffen, M. Ansmann, R. McDermott, N. Katz, Radoslaw C. Bialczak, Erik Lucero, Matthew Neeley, E.M. Weig, A.N. Cleland, and John M. Martinis

        Phys. Rev. Lett., 97, 050502 (2006)



·       Coherent State Evolution in a Superconducting Qubit from Partial-Collapse Measurement

        N. Katz, M. Ansmann, Radoslaw C. Bialczak, Erik Lucero, R. McDermott, Matthew Neeley, Matthias Steffen, E.M. Weig, A.N. Cleland, John M. Martinis, and A.N. Korotkov

        Science, 312, 1498 - 1500 (2006)



·       Measurement of the Entanglement of Two Superconducting Qubits via State Tomography

        Matthias Steffen, M. Ansmann, Radoslaw C. Bialczak, N. Katz, Matthew Neeley, E.M. Weig, A.N. Cleland, and John M. Martinis

        Science, 313, 1423 - 1425 (2006)






Press Coverage related to NMRQC experiments

·        Order-finding Experiment

·        Shor’s factoring experiment

·        Coupled Phase Qubit Experiment


Selected Talks / Presentations

·        Solid State Quantum Information Processing (SSQIP) 2003

·        California State University Fresno, Physics Colloquium (invited talk) 2003

·        University of Georgia at Athens, Physics Colloquium (invited talk) 2005

·        University of Innsbruck, Austria, Physics Colloquium (invited talk) 2006

·        American Physical Society (APS) 2003, 2005, 2006

·        American Physical Society (APS) 2002

·        Hewlett-Packard 2002 (invited talk)

·        Southwest Quantum Information and Technology Network (SQUINT) 2001

·        Experimental Nuclear Magnetic Resonance Conference (ENC) (2000 – 2002)


Miscellaneous Quantum Computing

See what Dilbert has to say about Quantum Computing: