CV
Dr Jared Jeyaretnam
Summary
I am a Research Fellow at the University of Nottingham, where I work on non-equilbrium quantum-many body dynamics, with a particular interest in circuit-based approaches. I previously completed my PhD at University College London before undertaking a postdoc at the University of Leeds.
Work Experience
- Research Fellow2025–presentUniversity of Nottingham, UKJointly supervised by Adam Gammon-Smith, Juan P. Garrahan, Bruno Bertini, and Igor Lesanovsky. I work on non-equilbrium quantum-many body dynamics, with a particular interest in quantum information, tensor networks, and quantum circuits.
- Research Fellow2023–2025University of Leeds, UKWorking with Zlatko Papic and the Theory Group, I researched ergodicity-breaking phenomena such as Hilbert space fragmentation in lattice gauge theories and many-body localisation, using diverse numerical techniques such as exact diagonalisation, tensor networks, perturbation theory, Clifford circuits, and the real-space renormalisation group.
Education
- PhD in Theoretical Condensed Matter Physics2019–2023University College London, UK
- Thesis: Ergodicity breaking and stabilisation of quantum order
- Supervisor: Arijeet Pal
- MSci. in Natural Sciences2015–2019University of Cambridge, UKAchieved a high first in all four years (including top first in Part II, for which I was awarded the Hartree & Clerk Maxwell Prize and the Ver Heyden de Lancey Prize)
- Master's project: Studying edge states in an eightfold quasicrystal, working with Prof Ulrich Schneider in the AMOP group
- Summer research project: Working with Claudio Castelnovo, I studied the effects of correlated hopping on the dynamics of classical spin ice using Monte Carlo simulations
- International Physics Olympiad (IPhO)2015–2015Silver medallist and highest scoring member of the UK team
Publications
- Quantum trajectory simulation of two-dimensional non-equilibrium steady states with a trapped ion quantum processor2026arXivWe experimentally realise quantum trajectories for a two-dimensional system—of hard-core bosons or fermions—driven by stochastic particle injection and removal at opposite corners of a square lattice. We probe the resulting non-equilibrium steady state and persistent current, finding measurable effects from particle statistics, interactions, and an applied magnetic field, showcasing both the power and current limitations of quantum computers as a platform for studying open quantum many-body systems.
- Ergodicity breaking in matrix-product-state effective Hamiltonians2026arXivWe demonstrate that the DMRG effective Hamiltonian—an object routinely used to variationally approximate ground states—encodes detailed information about thermalization dynamics far from equilibrium. In the random-field XXZ spin chain, its spectrum captures the thermal-to-many-body-localised transition, including spatially-resolved probes of ergodic bubbles, as well as quantum many-body scars, establishing it as a versatile spectral probe of ergodicity breaking in large systems beyond the reach of exact diagonalisation.
- Hilbert space fragmentation at the origin of disorder-free localization in the lattice Schwinger model2025Communications Physics (featured selection)Recent works have reported potential disorder-free localization in the lattice Schwinger model. Using degenerate perturbation theory and numerical simulations based on matrix product states, we identify the origin of a claimed ultraslow growth of entanglement as due to an approximate Hilbert space fragmentation and an emergent dynamical constraint on particle hopping
- Renormalisation view on resonance proliferation between many-body localised phases2023Physical Review BWe study the statistical properties of many-body resonances in a disordered interacting Ising chain - which can host symmetry protected topological order - using a Clifford circuit encoding of the real space renormalisation group. We show that both MBL phases present remain stable to resonances, but in the vicinity of the transition between them localisation is destabilised by resonance proliferation.
- Quantum scars and bulk coherence in a symmetry-protected topological phase2021Physical Review BQuantum many-body scars provide a novel mechanism for enhancing coherence of weakly entangled states; while coherent edge modes in certain symmetry protected topological (SPT) phases can persist away from the ground state. We uncover many-body scars and their implications on bulk coherence in such an SPT phase, shedding light on their role in preserving SPT order at finite temperature and the possibility of coherent bulk dynamics in models with SPT order beyond long-lived edge modes.
Talks and Posters
- Poster: Ergodicity breaking in matrix-product-state effective Hamiltonians2026SimQuDyn 2026, LMU, Munich
- Poster: Hilbert Space Fragmentation and Disorder-Free Localisation in a Lattice Gauge Theory2025New frontiers in out-of-equilibrium quantum many-body dynamics, MPI-PKS, Dresden
- Poster: Hilbert Space Fragmentation and Disorder-Free Localisation in a Lattice Gauge Theory2025SimQuDyn 2025, LMU, Munich
- Talk: Hilbert Space Fragmentation and Disorder-Free Localisation in a Lattice Gauge Theory2025Nottingham Symposium on Quantum Systems, Nottingham
- Poster: Does Many-Body Localization exist in U(1) lattice gauge theories?2024Localisation: Emergent Trends and Novel Platforms, MPI-PKS, Dresden
- Poster: Quantum Circuit Analysis of an MBL phase transition2024Localisation: Emergent Trends and Novel Platforms, MPI-PKS, Dresden
- Poster: Quantum Circuit Analysis of an MBL phase transition2024International Quantum Tensor Network, Glasgow
- Talk: Localisation and Hilbert Space Fracture in Lattice Gauge Theories2024Bridging the physics and mathematics of quantum many-body chaos, Helsinki
- Poster: Quantum Circuit Analysis of an MBL phase transition2024International Quantum Tensor Network, Glasgow
- Poster: Renormalisation view on resonance proliferation2023Quantum Information Processing, Ghent
Teaching
- Various courses2020University College London, UKRole: Postgraduate Teaching AssistantI taught on a variety of courses, including assisting with computational workshops, marking work, and leading & designing problem-solving tutorial classes.