Home > Seminars > Quantum Computing Using Superconducting Qubits

Quantum Computing Using Superconducting Qubits


2/12/2014 at 2:00PM


2/12/2014 at 3:00PM


246 DeBartolo Hall


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Anthony Hoffman

Anthony Hoffman

VIEW FULL PROFILE Email: ajhoffman@nd.edu
Phone: 574-631-4103
Website: https://www.ee.nd.edu/research-lab-websites/hoffmanlab
Office: 266 Fitzpatrick Hall


College of Engineering Associate Professor
Mid-infrared & THz Photonics Group Principal Investigator
Research Interests:  Prof. Hoffman's mid-infrared and THz optoelectronics research is focused on understanding quantum phenomena for the development of new optical materials, sources, and detectors.  Much of his work focuses on quantum engineering, where hundreds of layers of extremely thin ...
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We will review IBM’s current approach towards building a quantum computer using superconducting qubits. Large systems will require quantum error correction techniques and recently it has been shown that such techniques based on two-dimensional surface codes have a remarkably low fault tolerant threshold. Surface codes have guided our vision for several years and form the core of our approach. We will show experimental progress toward implementing surface codes, including a description of our qubits whose coherence times (T1, T2) are near 50 micro-seconds. Together with 100ns-400ns long all-microwave two-qubit gates, we show two-qubit gate fidelities near 95%. Because our approach does not require explicit frequency tuning of the qubits, calibration routines are straight forward. We will conclude by outlining some future challenges that face the community on our quest towards larger systems, as well as pointing out fruitful areas of quantum engineering which have influenced other branches of physics.

Seminar Speaker:

Matthias Steffen

Matthias Steffen

IBM T. J. Watson’s Research Facility

Matthias Steffen is manager of the Experimental Quantum Computing team at IBM T.J. Watson’s Research facility in Yorktown Heights. He received his Ph.D. degree in electrical engineering from Stanford University in 2003. After postdoc positions at NIST in Boulder, Colorado, and University of California, Santa Barbara, he joined IBM in 2006 and since 2010 manages the quantum computing team. His research career has focused on experimental realizations of quantum bits applicable for quantum information processing, including liquid state NMR and superconducting qubits.