I specialize in mathematical physics. I am motivated by the information-theoretic aspects of nature.

At IHES, I am focusing mainly on applying category-theory to quantum information theory, more specifically Bayesian inference and functorial entropy. Although this may sound fancy, I spend most of my time doing (finite-dimensional!) linear algebra. I am very excited about this research direction, and I think a good part of it is approachable. Videos on a categorical introduction to Bayes’ theorem, which provides a nice background for the work on disintegrations below, can be watched here: https://www.youtube.com/playlist?list=PLSx1kJDjrLRQksb7H9fqRE8GVMJdkX-4A.

I have also spent some time thinking about higher gauge theory, and more generally 2-dimensional algebra. This describes a way of associating algebraic data to 2-dimensional surfaces that is compatible with the way that 2-dimensional surfaces can be glued (i.e. “sewn”) together.

Even earlier, I worked on condensed matter and periodic potentials using functional analysis and measure theory.

I’m generally interested in many, many, many things. It would be obnoxious to list all the subjects/topics. But some of my favorites to think about from time to time include: the information paradox, operator algebras, quantum measurement, life, homotopy theory, algebraic topology, non-commutative geometry, higher category theory, geometric quantization, etc.

Below, I include some preprints and publications, organized first by category and then from most recent to older works.

### Algebraic quantum theory

- “A non-commutative Bayes’ theorem,” with Benjamin P Russo
*(2020)*Available as

https://arxiv.org/abs/2005.03886

- “Inverses, disintegrations, and Bayesian inversion in quantum Markov categories,”
*(2020)*Available as

https://arxiv.org/abs/2001.08375

- “Non-commutative disintegrations: existence and uniqueness in finite dimensions,” with Benjamin P Russo
*(2019)*Available as

https://arxiv.org/abs/1907.09689

- “Stinespring’s construction as an adjunction,”
*Accepted in Compositionality on 2019-07-24*

https://arxiv.org/abs/1807.02533

- “From observables and states to Hilbert space and back: a 2-categorical adjunction,” Applied Categorical Structures, Vol.
**26**, Issue 6, pp 1123-1157 (2018). Available as https://link.springer.com/article/10.1007/s10485-018-9522-6 and

https://arxiv.org/abs/1609.08975

### Analysis

- “Discrete probabilistic and algebraic dynamics: a stochastic Gelfand-Naimark Theorem,”

https://arxiv.org/abs/1708.00091

### Higher gauge theory

- “Two-dimensional algebra in lattice gauge theory,”
*Journal of Mathematical Physics***60**, 043506 (2019); https://doi.org/10.1063/1.5078532. Also available as

https://arxiv.org/abs/1802.01139

- “Gauge invariant surface holonomy and monopoles,” Theory and Applications of Categories, Vol.
**30**, No. 42, pp 1319-1428 (2015)

http://www.tac.mta.ca/tac/volumes/30/42/30-42abs.html

### Condensed matter

- “Sufficient conditions for two-dimensional localization by arbitrarily weak defects in periodic potentials with band gaps” with Karen K. Y. Lee, Yehuda Avniel, and Steven G. Johnson, Phys. Rev. B
**81**, 155324 (2010)

http://journals.aps.org/prb/abstract/10.1103/PhysRevB.81.155324