Photo of Sean Hallgren

Sean Hallgren

Professor

Affiliation(s):

  • School of Electrical Engineering and Computer Science
  • Computer Science and Engineering

W350 Westgate Building

sjh26@psu.edu

814-863-1265

Personal or Departmental Website

Research Areas:

Theoretical Computer Science

Interest Areas:

Quantum computation, Theoretical computer science.

 
 

 

Education

  • BS, Computer Science, Carnegie Mellon University, 1994
  • Ph D, Computer Science, University of California, Berkeley, 2000

Publications

Books

  • , 2008, Encyclopedia of Algorithms, Springer

Journal Articles

  • Jintai Ding, Vlad Gheorghiu, Andras Gilyen, Sean Hallgren and Jianqiang Li, 2023, "Limitations of the Macaulay matrix approach for using the HHL algorithm to solve multivariate polynomial systems", Quantum, 7, pp. 1069
  • Nai-Hui Chia, Sean Hallgren and Fang Song, 2020, "On Basing One-way Permutations on NP-hard Problems under Quantum Reductions", Quantum, 4, pp. 1-23
  • Sean Hallgren, Adam D Smith and Fang Song, 2015, "Classical Cryptographic Protocols in a Quantum World", International Journal of Quantum Information, 13, (4)
  • Kirsten Eisenträger, Sean Hallgren and Kristin E. Lauter, 2014, "Weak Instances of PLWE", IACR Cryptology ePrint Archive, 2014, pp. 784
  • S. Hallgren, D. Nagaj and S. Narayanaswami, 2013, "The Local Hamiltonian Problem on a Line with Eight States is QMA-Complete", Quantum Information & Computation, 13, (9/10), pp. 721-750
  • S. Hallgren, C. Moore, M. Rotteler, A. Russell and P. Sen, 2010, "Limitations of Quantum Coset States for Graph Isomorphism", 57, (6)
  • Sean Hallgren, 2007, "Polynomial-time quantum algorithms for Pell’s equation and the principalideal problem", Journal of the ACM, 54, (1), pp. 1-19
  • S. Hallgren, 2007, "The Local Hamiltonian Problem on a Line with Eight States is QMA-Complete", 54, (1), pp. 1-19
  • Sean Hallgren, 2007, "Polynomial-time quantum algorithms for Pell’s equation and the principal ideal problem", J. ACM, 54, (1)
  • W. van Dam, Sean Hallgren and L. Ip, 2006, "Quantum Algorithms for Some Hidden Shift Problems", 36, (3), pp. 763-778
  • S. Hallgren, A. Russell and A. Ta-Shma, 2003, "The Hidden Subgroup Problem and Quantum Computation Using Group Representations", 32, (4), pp. 916-934
  • Wim van Dam and Sean Hallgren, 2000, "Efficient Quantum Algorithms for Shifted Quadratic Character Problems", CoRR, quant-ph/0011067

Conference Proceedings

  • Kirsten Eisentraeger, Sean Hallgren, Chris Leonardi, Travis Morrison and Jennifer Park, 2020, "Computing endomorphism rings of supersingular elliptic curves and connections to pathfinding in isogeny graphs", 4, (1), pp. 215-232
  • Sean Hallgren, Eunou Lee and Ojas Parekh, 2020, "An Approximation Algorithm for the MAX-2-Local Hamiltonian Problem", 176, pp. 1-18
  • Nai-Hui Chia and Sean Hallgren, 2016, "How Hard Is Deciding Trivial Versus Nontrivial in the Dihedral Coset Problem?", Schloss Dagstuhl--Leibniz-Zentrum fuer Informatik, Dagstuhl, Germany, Germany, 61, pp. 16
  • Kirsten Eisenträger, Sean Hallgren and Kristin Lauter, 2014, "Weak instances of PLWE", pp. 12
  • Kirsten Eisenträger, Sean Hallgren, Alexei Kitaev and Fang Song, 2014, "A quantum algorithm for computing the unit group of an arbitrary degree number field", pp. 293–302
  • , 2014, "Selected Areas in Cryptography - SAC 2014 - 21st International Conference, Montreal, QC, Canada, August 14-15, 2014, Revised Selected Papers", Springer, 8781
  • , 2014, "Symposium on Theory of Computing, STOC 2014, New York, NY, USA, May 31 - June 03, 2014", ACM
  • S. Hallgren and K. Eisentraeger, 2012, "Computing the Unit Group, Class Group, and Compact Representations in Algebraic Function Fields", pp. 18
  • Sean Hallgren, Adam D Smith and Fang Song, 2011, "Classical Cryptographic Protocols in a Quantum World", pp. 411–428
  • , 2011, "Advances in Cryptology - CRYPTO 2011 - 31st Annual Cryptology Conference, Santa Barbara, CA, USA, August 14-18, 2011. Proceedings", Springer, 6841
  • Sean Hallgren, A. Smith and F. Song, 2011, "Classical Cryptographic Protocols in a Quantum World", Proceedings of the Fourteenth Workshop on Quantum Information Processing (QIP 2011), pp. 18
  • Kirsten Eisenträger and Sean Hallgren, 2010, "Algorithms for Ray Class Groups and Hilbert Class Fields", pp. 471–483
  • , 2010, "Proceedings of the Twenty-First Annual ACM-SIAM Symposium on Discrete Algorithms, SODA 2010, Austin, Texas, USA, January 17-19, 2010", SIAM
  • Sean Hallgren, Alexandra Kolla, Pranab Sen and Shengyu Zhang, 2008, "Making Classical Honest Verifier Zero Knowledge Protocols Secure againstQuantum Attacks", pp. 592–603
  • Sean Hallgren and Aram Wettroth Harrow, 2008, "Superpolynomial Speedups Based on Almost Any Quantum Circuit", pp. 782–795
  • , 2008, "Automata, Languages and Programming, 35th International Colloquium, ICALP 2008, Reykjavik, Iceland, July 7-11, 2008, Proceedings, Part I: Tack A: Algorithms, Automata, Complexity, and Games", Springer, 5125
  • , 2008, "Automata, Languages and Programming, 35th International Colloquium, ICALP 2008, Reykjavik, Iceland, July 7-11, 2008, Proceedings, Part II - Track B: Logic, Semantics, and Theory of Programming & Track C: Security and Cryptography Foundations", Springer, 5126
  • Sean Hallgren, Alexandra Kolla, Pranab Sen and Shengyu Zhang, 2008, "Making Classical Honest Verifier Zero Knowledge Protocols Secure against Quantum Attacks", pp. 592–603
  • Sean Hallgren, Cristopher Moore, Martin Rötteler, Alexander Russell and Pranab Sen, 2006, "Limitations of quantum coset states for graph isomorphism", pp. 604–617
  • , 2006, "Proceedings of the 38th Annual ACM Symposium on Theory of Computing, Seattle, WA, USA, May 21-23, 2006", ACM
  • Sean Hallgren, Alexander Russell and Igor Shparlinski, 2005, "Quantum Noisy Rational Function Reconstruction", pp. 420–429
  • Sean Hallgren, 2005, "Fast quantum algorithms for computing the unit group and class groupof a number field", pp. 468–474
  • , 2005, "Proceedings of the 37th Annual ACM Symposium on Theory of Computing, Baltimore, MD, USA, May 22-24, 2005", ACM
  • , 2005, "Computing and Combinatorics, 11th Annual International Conference, COCOON 2005, Kunming, China, August 16-29, 2005, Proceedings", Springer, 3595
  • Sean Hallgren, 2005, "Fast quantum algorithms for computing the unit group and class group of a number field", pp. 468–474
  • , 2003, "Proceedings of the Fourteenth Annual ACM-SIAM Symposium on Discrete Algorithms, January 12-14, 2003, Baltimore, Maryland, USA", ACM/SIAM
  • Wim van Dam, Sean Hallgren and Lawrence Ip, 2003, "Quantum algorithms for some hidden shift problems", pp. 489–498
  • Sean Hallgren, 2002, "Polynomial-time quantum algorithms for Pell’s equation and the principalideal problem", pp. 653–658
  • Sean Hallgren, 2002, "Polynomial-time quantum algorithms for Pell’s equation and the principal ideal problem", pp. 653–658
  • , 2002, "Proceedings on 34th Annual ACM Symposium on Theory of Computing, May 19-21, 2002, Montréal, Québec, Canada", ACM
  • Lisa Hales and Sean Hallgren, 2000, "An Improved Quantum Fourier Transform Algorithm and Applications", pp. 515–525
  • Sean Hallgren, Alexander Russell and Amnon Ta-Shma, 2000, "Normal subgroup reconstruction and quantum computation using grouprepresentations", pp. 627–635
  • , 2000, "41st Annual Symposium on Foundations of Computer Science, FOCS 2000, 12-14 November 2000, Redondo Beach, California, USA", IEEE Computer Society
  • Sean Hallgren, Alexander Russell and Amnon Ta-Shma, 2000, "Normal subgroup reconstruction and quantum computation using group representations", pp. 627–635
  • , 2000, "Proceedings of the Thirty-Second Annual ACM Symposium on Theory of Computing, May 21-23, 2000, Portland, OR, USA", ACM
  • Lisa Hales and Sean Hallgren, 1999, "Quantum Fourier Sampling Simplified", pp. 330–338
  • , 1999, "Proceedings of the Thirty-First Annual ACM Symposium on Theory of Computing, May 1-4, 1999, Atlanta, Georgia, USA", ACM
  • Kirsten Eisentraeger, Sean Hallgren, Kristin Lauter, Travis Morrison and Christophe Petit, , "Supersingular Isogeny Graphs and Endomorphism Rings: Reductions and Solutions"

Abstracts

  • Sean Hallgren and Eunou Lee, , "An approximation algorithm for the MAX-2-Local Hamiltonian problem", 23th Annual Conference on Quantum Information Processing (QIP 2020)

Other

  • Kirsten Eisentraeger, Sean Hallgren and Travis Morrison, 2017, "On the Hardness of Computing Endomorphism Rings of Supersingular Elliptic Curves", Cryptology ePrint Archive, Report 2017/986
  • Nai-Hui Chia, Sean Hallgren and Fang Song, , "On basing one-way permutations on NP-hard problems under quantum reductions"

Research Projects

Honors and Awards

Service

Service to Penn State:

Service to External Organizations:

 


 

About

The School of Electrical Engineering and Computer Science was created in the spring of 2015 to allow greater access to courses offered by both departments for undergraduate and graduate students in exciting collaborative research fields.

We offer B.S. degrees in electrical engineering, computer science, computer engineering and data science and graduate degrees (master's degrees and Ph.D.'s) in electrical engineering and computer science and engineering. EECS focuses on the convergence of technologies and disciplines to meet today’s industrial demands.

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