Publications

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Journal Articles

Hilbert space fragmentation at the origin of disorder-free localization in the lattice Schwinger model

Published in Communications Physics, 2025

Graphical abstract Featured selection for April 2025! Lattice gauge theories, the discrete counterparts of continuum gauge theories, provide a rich framework for studying non-equilibrium quantum dynamics. Recent studies suggest disorder-free localization in the lattice Schwinger model, but its origin remains unclear. Using a combination of analytical and numerical methods, we show that Hilbert space fragmentation emerges in the strong coupling limit, constraining particle dynamics and causing sharp jumps in entanglement entropy growth within charge sectors. Read more

Recommended citation: Jared Jeyaretnam, Tanmay Bhore, Jesse Osborne, Jad Halimeh, Zlatko Papic, "Hilbert space fragmentation at the origin of disorder-free localization in the lattice Schwinger model." Commun. Phys. 8 172, 2025.
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Renormalization view on resonance proliferation between many-body localized phases

Published in Physical Review B, 2023

Topology and many-body localization (MBL) have opened new avenues for preserving quantum information at finite energy density. Resonant delocalization plays a crucial role in destabilizing these phenomena. In this paper, we study the statistical properties of many-body resonances in a disordered interacting Ising model—which can host symmetry-protected topological order—using a Clifford circuit encoding of the real-space renormalization group which allows the resonant properties of the wave functions to be efficiently characterized. Read more

Recommended citation: Jared Jeyaretnam, Christopher Turner, Arijeet Pal, "Renormalization view on resonance proliferation between many-body localized phases." Phys. Rev. B, 2023.
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Quantum scars and bulk coherence in a symmetry-protected topological phase

Published in Physical Review B, 2021

Formation of quantum scars in many-body systems provides a novel mechanism for enhancing coherence of weakly entangled states. At the same time, coherence of edge modes in certain symmetry-protected topological (SPT) phases can persist away from the ground state. In this work we show the existence of many-body scars and their implications on bulk coherence in such an SPT phase. Read more

Recommended citation: Jared Jeyaretnam, Jonas Richter, Arijeet Pal, "Quantum scars and bulk coherence in a symmetry-protected topological phase." Physical Review B, 2021.
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Phd Thesis

Ergodicity breaking and stabilisation of quantum order (PhD Thesis)

Published in University College London, 2023

Supervisor: Arijeet Pal At zero temperature, symmetry-protected topological (SPT) order can encode quantum information in an edge strong zero mode, robust to perturbations respecting some symmetry. On the other hand, phenomena like many-body localisation (MBL) and quantum scarring can arrest the approach to thermal equilibrium, contrary to the ergodic dynamics expected of generic quantum systems. This raises the possibility that by combining SPT order with such ergodicity breaking phenomena, one might be able to construct a quantum memory that is robust at finite temperature. However, MBL is threatened by thermal avalanches due to rare low-disorder grains, while the survival of quantum scars in the thermodynamic limit is still uncertain beyond certain finely-tuned models. Read more

Recommended citation: Jared Jeyaretnam, "Ergodicity breaking and stabilisation of quantum order (PhD Thesis)." University College London, 2023.
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