# Robert Calderbank

- Charles S. Sydnor Professor of Computer Science
- Professor of Computer Science
- Director of the Information Initiative at Duke
- Professor of Electrical and Computer Engineering (Joint)
- Professor of Mathematics (Joint)
- Professor of Physics (Secondary)

**External address:**140 Science Drive, 317 Gross Hall, Durham, NC 27708

**Internal office address:**Campus Box 90984, 140 Science Drive, Durham, NC 27708

**Phone:**(919) 613-7874

### Research Areas and Keywords

##### Algebra & Combinatorics

##### Analysis

##### Computational Mathematics

##### Number Theory

##### Physical Modeling

##### Probability

##### Signals, Images & Data

Robert Calderbank is Director of the Information Initiative at Duke University, where he is Professor of Electrical Engineering, Computer Science and Mathematics. He joined Duke in 2010, completed a 3 year term as Dean of Natural Sciences in August 2013, and also served as Interim Director of the Duke Initiative in Innovation and Entrepreneurship in 2012. Before joining Duke he was Professor of Electrical Engineering and Mathematics at Princeton University where he also directed the Program in Applied and Computational Mathematics.

Before joining Princeton University Dr. Calderbank was Vice President for Research at AT&T. As Vice President for Research he managed AT&T intellectual property, and he was responsible for licensing revenue. AT&T Labs was the first of a new type of research lab where masses of data generated by network services became a giant sandbox in which fundamental discoveries in information science became a source of commercial advantage

At Duke, Dr. Calderbank works with researchers from the Duke Center for Autism and Brain Development, developing information technology that is able to capture a full spectrum of behavior in very young children. By supporting more consistent and cost-effective early diagnosis, the team is increasing the opportunity for early interventions that have proven very effective.

At the start of his career at Bell Labs, Dr. Calderbank developed voiceband modem technology that was widely licensed and incorporated in over a billion devices. Voiceband means the signals are audible so these modems burped and squeaked as they connected to the internet. One of these products was the AT&T COMSPHERE^{®} modem which was the fastest modem in the world in 1994 – at 33.6kb/s!

Together with Peter Shor and colleagues at AT&T Labs Dr. Calderbank developed the group theoretic framework for quantum error correction. This framework changed the way physicists view quantum entanglement, and provided the foundation for fault tolerant quantum computation.

Dr. Calderbank has also developed technology that improves the speed and reliability of wireless communication by correlating signals across several transmit antennas. Invented in 1996, this *space-time coding* technology has been incorporated in a broad range of 3G, 4G and 5G wireless standards. He served on the Technical Advisory Board of Flarion Technologies a wireless infrastructure company founded by Rajiv Laroia and acquired by Qualcomm for $1B in 2008.

Dr. Calderbank is an IEEE Fellow and an AT&T Fellow, and he was elected to the National Academy of Engineering in 2005. He received the 2013 IEEE Hamming Medal for contributions to coding theory and communications and the 2015 Shannon Award.

Harms, A, Bajwa, WU, and Calderbank, R. "Identification of Linear Time-Varying Systems Through Waveform Diversity." *IEEE Transactions on Signal Processing* 63.8 (April 2015): 2070-2084.
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Wang, L, Huang, J, Yuan, X, Krishnamurthy, K, Greenberg, J, Cevher, V, Rodrigues, MRD, Brady, D, Calderbank, R, and Carin, L. "Signal Recovery and System Calibration from Multiple Compressive Poisson Measurements." *SIAM Journal on Imaging Sciences* 8.3 (January 2015): 1923-1954.
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Liming Wang, , Carlson, DE, Rodrigues, MRD, Calderbank, R, and Carin, L. "A Bregman Matrix and the Gradient of Mutual Information for Vector Poisson and Gaussian Channels." *IEEE Transactions on Information Theory* 60.5 (May 2014): 2611-2629.
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Bennatan, A, Shamai, S, and Calderbank, AR. "Soft-Decoding-Based Strategies for Relay and Interference Channels: Analysis and Achievable Rates Using LDPC Codes." *IEEE Transactions on Information Theory* 60.4 (April 2014): 1977-2009.
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Goparaju, S, and Calderbank, R. "Binary cyclic codes that are locally repairable." *IEEE International Symposium on Information Theory - Proceedings* (January 1, 2014): 676-680.
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Nokleby, M, Rodrigues, M, and Calderbank, R. "Discrimination on the grassmann manifold: Fundamental limits of subspace classifiers." *IEEE International Symposium on Information Theory - Proceedings* (January 1, 2014): 3012-3016.
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Goparaju, S, El Rouayheb, S, and Calderbank, R. "New codes and inner bounds for exact repair in distributed storage systems." *IEEE International Symposium on Information Theory - Proceedings* (January 1, 2014): 1036-1040.
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Calderbank, R, Thompson, A, and Xie, Y. "On block coherence of frames." *Applied and Computational Harmonic Analysis* 38.1 (January 1, 2014): 50-71.
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Goparaju, S, Rouayheb, SE, and Calderbank, R. "New codes and inner bounds for exact repair in distributed storage systems." *2014 48th Annual Conference on Information Sciences and Systems, CISS 2014* (January 1, 2014).
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Carpenter, K, Sprechmann, P, Fiori, M, Calderbank, R, Egger, H, and Sapiro, G. "Questionnaire simplification for fast risk analysis of children's mental health." *ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings* (January 1, 2014): 6009-6013.
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## Pages

Vahid, A, Shomorony, I, and Calderbank, R. "Informational bottlenecks in two-unicast wireless networks with delayed CSIT." April 4, 2016. Full Text

Goparaju, S, Rouayheb, SE, and Calderbank, R. "Can linear minimum storage regenerating codes be universally secure?." February 26, 2016. Full Text

Thompson, A, and Calderbank, R. "Compressive imaging using fast transform coding." January 1, 2016. Full Text

Nokleby, M, Beirami, A, and Calderbank, R. "A rate-distortion framework for supervised learning." November 10, 2015. Full Text

Eslami, A, Velasco, A, Vahid, A, Mappouras, G, Calderbank, R, and Sorin, DJ. "Writing without disturb on phase change memories by integrating coding and layout design." October 5, 2015. Full Text

Vahid, A, and Calderbank, R. "Impact of local delayed CSIT on the capacity region of the two-user interference channel." September 28, 2015. Full Text

Sokolić, J, Renna, F, Calderbank, R, and Rodrigues, MRD. "Mismatch in the classification of linear subspaces: Upper bound to the probability of error." September 28, 2015. Full Text

Beirami, A, Calderbank, R, Duffy, K, and Medard, M. "Quantifying computational security subject to source constraints, guesswork and inscrutability." September 28, 2015. Full Text

Tamo, I, Barg, A, Goparaju, S, and Calderbank, R. "Cyclic LRC codes and their subfield subcodes." September 28, 2015. Full Text

Renna, F, Wang, L, Yuan, X, Yang, J, Reeves, G, Calderbank, R, Carin, L, and Rodrigues, MRD. "Classification and reconstruction of compressed GMM signals with side information." September 28, 2015. Full Text