Matthias Steffen's Home Page

Welcome to my home page!

Matthias Steffen

Research Staff Member – IBM Watson
(2006 – present)

msteffe [at] us [dot] ibm [dot] com

Physics Postdoc - UCSB
(2004-2006)

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

Projects

· 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.

Publications

NMRQC

· 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)

[PDF]

· 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)

[PDF]

· 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)

[PDF]

· 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)

[PDF]

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