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Alexandra M. Jurgens, PhD
Postdoctoral Researcher
Inria Centre at the University of Bordeaux
GEOSTAT and COMCAUSA

alexandra (dot) jurgens (at) inria (dot) fr

Research
Publications
Blog

Github
CV

 



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A fractal set of causal states.

My research interests, summarized

For more detail and some fun visualizations please see my Research page.




A little bit about me

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The majestic beagle.

I am currently a postdoctoral researcher at INRIA Bordeaux working with Nicolas Brodu on theory of continuous computational mechanics and practical algorithms for building models of real-world systems. As one real-world system, we have been studying communication in humpback whales! However, bulk of this work has been on building out a theoretical framework for discovering causal structure using reproducing kernel Hilbert spaces (RKHS). See research notes below for more information.

I was previously a postdoc at University of California, Davis, with the Complexity Sciences Center. My advisor is Jim Crutchfield. My work at Davis focused on developing tools for the study of infinite state hidden Markov models, focusing on the Shannon entropy rate and the divergence of statistical complexity. This is accomplished by recasting the hidden Markov models as chaotic dynamical systems and applying tools from dynamical systems to study the information theoretic properties of the underlying process. This theoretical work has found has found application to quantum measurement of single-qubit sources, as well as in the study of the exact thermodynamic functioning of Maxwellian-ratchet style information engines.

Before coming to Davis, I attended Marietta College from 2011 to 2015, where I earned a BS in Physics and a BS in Math. During my undergraduate years I was lucky to be mentored by (the sadly late) Cavendish McKay, who introduced me to the study of chaotic systems. For this, I cannot thank him enough. Prior to this introduction, I was focused on optics: as an undergraduate I spent one summer at the ENS Cachan Quantum and Molecular Photonics Laboratory (LPQM) in Paris through the Optics in the City of Light iREU at the University of Michigan, and another at the Linac Coherent Light Source (LSLC) through the Department of Energy SULI program.

Although I have been lucky to live and travel around the world, I was raised in the Bay Area. My pronouns are she/her. When I am not working on research, I am dancing ballet, out rock climbing, or cuddling up with my 16 year old beagle, Abby. If you're interested in keeping up with me on social media, my twitter is (semi-) active.

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Modeling some belaying glasses.


Publications

Journal Articles

    Ambiguity Rate of Hidden Markov Processes
    Jurgens A., Crutchfield J.
    Phys. Rev. E 104, 064107 2021

    Divergent Predictive Memory: The Statistical Complexity Dimension of Stationary, Ergodic Finite-State Hidden Markov Processes
    Jurgens A., Crutchfield J.
    Chaos 31, 083114, 2021.

    Shannon Entropy Rate of Hidden Markov Processes
    Jurgens A., Crutchfield J.
    J. Stat. Phys., 183 (2), 1-18, 2020.

    Functional thermodynamics of Maxwellian ratchets: Constructing and deconstructing patterns, randomizing and derandomizing behaviors
    Jurgens A., Crutchfield J.
    Phys. Rev. Research 2, 033334. 2020 Aug 28

    Measurement-Induced Randomness and Structure in Controlled Qubit Processes
    Venegas-Li A., Jurgens A., Crutchfield J.
    Phys. Rev. E, 102(4):040102(R), 2020.

    Miscellaneous

      Quantifying and comparing 'memory' in biological, ecological, physical, and socio-economic systems
      Jurgens A., Kraay A., Weissman J., Dong J., Pangallo M., Wu S., Stopnitzky S., Zhan S.H., Gurevich Y., Liu Y.
      Sante Fe Institute Complex Systems Summer School 2017 Proceedings

      Entropy in Written English.
      Jurgens, A.
      Class proceedings from the 2016 The Physics of Information course at University of California, Davis.



    My attempt to spiritually bring back web rings

    Friends, Mentors, Acquaintances

    Various other Interesting Things