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involvement
💼 Conferences Attended
🎤 Talks
APS Global Physics Summit 2025
Anaheim, CA — March 16–21, 2025
Title: Crystalline Symmetry-Enriched Quantum Criticality
Title: Crystalline Symmetry-Enriched Quantum Criticality
SPIE Defense + Commercial Sensing 2023
Orlando, FL — April 30–May 4, 2023
Title: Quantum non-demolition photon counting in a 2d Rydberg atom array
Title: Quantum non-demolition photon counting in a 2d Rydberg atom array
APS March Meeting 2021
Virtual — March 15-19, 2021
Title: Mesoscopic Material Properties from Magnon Scattering in Thin Films
Title: Mesoscopic Material Properties from Magnon Scattering in Thin Films
📊 Posters
Institute for Robust Quantum Simulation Workshop 2025
Durham, NC — June 4–5, 2025
Princeton Summer School on Condensed Matter Physics 2023
Princeton, NJ — July 10–14, 2023
School Topic: "Fractionalization, criticality and unconventional quantum materials"
Title: Fusion category symmetry-protected topological order in the generalized cluster state
School Topic: "Fractionalization, criticality and unconventional quantum materials"
Title: Fusion category symmetry-protected topological order in the generalized cluster state
Quantum Information Processing (QIP) 2023
Ghent, Belgium — February 6–10, 2023
Title: Fusion category symmetry-protected topological order in the generalized cluster state
Title: Fusion category symmetry-protected topological order in the generalized cluster state
📅 Events Organized
- UMD Condensed Matter Theory Student Seminar
- January-April 2025
- Harvard Society of Physics Students Chilloquium
- June 2020-May 2021
- Recordings Available Online
📚 Journals Refereed
Physical Review X, Physical Review Letters, Physical Review B
portfolio
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publications
Quantum Non-Demolition Photon Counting in a 2d Rydberg Atom Array
Christopher Fechisin, Kunal Sharma, Przemyslaw Bienias, Steven L. Rolston, J. V. Porto, Michael J. Gullans, Alexey V. Gorshkov
Rydberg arrays exhibit remarkable many-body physics due to strong Rydberg-Rydberg interactions which are possible between their constituent atoms. We present a protocol which leverages this physics to non-destructively count photons by temporarily storing them in the array.
Disclinations, dislocations, and emanant flux at Dirac criticality
Maissam Barkeshli, Christopher Fechisin, Zohar Komargodski, Siwei Zhong
We study the effects of lattice rotational and translational symmetries on Dirac cones in lattice models and the Dirac fermion field theories to which they flow in the continuum. In particular, we find that models defined on lattices with defects flow to field theories with additional magnetic flux, the amount of which is determined by universal topological data. We use defect conformal field theory to identify observables sensitive to this additional flux and then measure it in critical lattice models.
Noninvertible Symmetry-Protected Topological Order in a Group-Based Cluster State
Christopher Fechisin, Nathanan Tantivasadakarn, Victor V. Albert
The cluster state is the simplest example of SPT order, protected by a $\mathbb{Z}_2\times\mathbb{Z}_2$ symmetry. In this work, we show that a generalized cluster state with fusion category symmetry $G\times\text{Rep}(G)$ shares many qualitative features with the ordinary cluster state and should be thought of as an SPT protected by a non-invertible symmetry.
Instability of steady-state mixed-state symmetry-protected topological order to strong-to-weak spontaneous symmetry breaking
Jeet Shah, Christopher Fechisin, Yu-Xin Wang, Joseph T. Iosue, James D. Watson, Yan-Qi Wang, Brayden Ware, Alexey V. Gorshkov, Cheng-Ju Lin
In this work, we interrogate the analogy between (i) pure state SPTs as ground states of local Hamiltonians and (ii) mixed state SPTs as steady states of local Lindbladians. We construct a Lindbladian which hosts a simple mixed-state SPT within its steady-state subspace, then add symmetric local perturbations to see if the new steady states lie in the same mixed-state phase as the original. We find that for generic symmetric perturbations, the answer is no, due to the onset of strong-to-weak spontaneous symmetry breaking.
teaching
Teaching experience 1
Undergraduate course, University 1, Department, 2014
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Teaching experience 2
Workshop, University 1, Department, 2015
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