317 citations · 473 across the 22 of their papers we have counts for
22 papers
Quantum many-body mixed phase space revealed by hybrid feedback control
Hang Dong, Jie Ren, Andrew Hallam +9
Understanding how complex systems transition between order and chaos is a central challenge of nonequilibrium physics. While weak perturbations of classical integrable systems give…
Ergodicity breaking in matrix-product-state effective Hamiltonians
Andrew Hallam, Jared Jeyaretnam, Zlatko Papić
Thermalization and its breakdown in interacting quantum many-body systems are governed by mid-spectrum eigenstates, which are typically accessible only in small system sizes amenab…
Spectral signatures of nonstabilizerness and criticality in infinite matrix product states
Andrew Hallam, Ryan Smith, Zlatko Papić
While nonstabilizerness (''magic'') is a key resource for universal quantum computation, its behavior in many-body quantum systems, especially near criticality, remains poorly unde…
Tunable quantum Mpemba effect in long-range interacting systems
Andrew Hallam, Matthew Yusuf, Aashish A. Clerk +2
Symmetry plays a fundamental role in many-body systems, both in and out of equilibrium. The quantum Mpemba effect (QME) - a phenomenon where systems initially farther from equilibr…
Entanglement and apparent thermality in simulated black holes
Iason A. Sofos, Andrew Hallam, Jiannis K. Pachos
We investigate the apparent thermality of Hawking radiation in the semi-classical limit of quantum black holes using the mean-field limit of a chiral spin-chain simulator, which mo…
ScarFinder: a detector of optimal scar trajectories in quantum many-body dynamics
Jie Ren, Andrew Hallam, Lei Ying +1
Mechanisms that give rise to coherent quantum dynamics, such as quantum many-body scars, have recently attracted much interest as a way of controlling quantum chaos. However, ident…
Quantum teleportation between simulated binary black holes
Aiden Daniel, Tanmay Bhore, Jiannis K. Pachos +2
The quantum description of a black hole predicts that quantum information hidden behind the event horizon can be teleported outside almost instantaneously. In this work, we demonst…
Stirring the false vacuum via interacting quantized bubbles on a 5564-qubit quantum annealer
Jaka Vodeb, Jean-Yves Desaules, Andrew Hallam +7
False vacuum decay is a potential mechanism governing the evolution of the early Universe, with profound connections to non-equilibrium quantum physics, including quenched dynamics…
Non-stabilizerness in kinetically-constrained Rydberg atom arrays
Ryan Smith, Zlatko Papić, Andrew Hallam
Non-stabilizer states are a fundamental resource for universal quantum computation. However,despite broad significance in quantum computing, the emergence of "many-body" non-stabil…
Optimally scrambling chiral spin-chain with effective black hole geometry
Aiden Daniel, Andrew Hallam, Matthew D. Horner +1
There is currently significant interest in emulating the essential characteristics of black holes, such as their Hawking radiation or their optimal scrambling behavior, using conde…
Integrability breaking and bound states in Google's decorated XXZ circuits
Ana Hudomal, Ryan Smith, Andrew Hallam +1
Recent quantum simulation by Google [Nature 612, 240 (2022)] has demonstrated the formation of bound states of interacting photons in a quantum-circuit version of the XXZ spin chai…
Exploring interacting chiral spin chains in terms of black hole physics
Ewan Forbes, Matthew D. Horner, Andrew Hallam +2
In this paper we explore the properties of a 1-dimensional spin chain in the presence of chiral interactions, focusing on the system's transition to distinct chiral phases for vari…
Embedding semiclassical periodic orbits into chaotic many-body Hamiltonians
Andrew Hallam, Jean-Yves Desaules, Zlatko Papić
Protecting coherent quantum dynamics from chaotic environment is key to realizations of fragile many-body phenomena and their applications in quantum technology. We present a gener…
Bridging quantum criticality via many-body scarring
Aiden Daniel, Andrew Hallam, Jean-Yves Desaules +4
Quantum dynamics in certain kinetically-constrained systems can display a strong sensitivity to the initial condition, wherein some initial states give rise to persistent quantum r…
Chiral Spin-Chain Interfaces Exhibiting Event-Horizon Physics
Matthew D. Horner, Andrew Hallam, Jiannis K. Pachos
The interface between different quantum phases of matter can give rise to novel physics, such as exotic topological phases or non-unitary conformal field theories. Here we investig…
Tuning between continuous time crystals and many-body scars in long-range XYZ spin chains
Kieran Bull, Andrew Hallam, Zlatko Papić +1
Persistent oscillatory dynamics in non-equilibrium many-body systems is a tantalizing manifestation of ergodicity breakdown that continues to attract much attention. Recent works h…
Phase Transitions in the Classical Simulability of Open Quantum Systems
F. Azad, A. Hallam, J. Morley +1
We study the evolution of an open quantum system using a Langevin unravelling of the density matrix evolution over matrix product states. As the strength of coupling to and tempera…
Emergence of Gaussianity in the thermodynamic limit of interacting fermions
Gabriel Matos, Andrew Hallam, Aydin Deger +2
Systems of interacting fermions can give rise to ground states whose correlations become effectively free-fermion-like in the thermodynamic limit, as shown by Baxter for a class of…
Entanglement compression in scale space: from the multiscale entanglement renormalization ansatz to matrix product operators
Karel Van Acoleyen, Andrew Hallam, Matthias Bal +3
The multiscale entanglement renormalization ansatz (MERA) provides a constructive algorithm for realizing wavefunctions that are inherently scale invariant. Unlike conformally inva…
The Lyapunov Spectrum of Quantum Thermalisation
Andrew Hallam, James Morley, Andrew G. Green
The eigenstate thermalisation hypothesis resolves the paradox of emergent thermal or classical behaviour in a closed quantum system by focussing upon local observations. This permi…
Hierarchical quantum classifiers
Edward Grant, Marcello Benedetti, Shuxiang Cao +5
Quantum circuits with hierarchical structure have been used to perform binary classification of classical data encoded in a quantum state. We demonstrate that more expressive circu…
Compact Neural Networks based on the Multiscale Entanglement Renormalization Ansatz
Andrew Hallam, Edward Grant, Vid Stojevic +2
This paper demonstrates a method for tensorizing neural networks based upon an efficient way of approximating scale invariant quantum states, the Multi-scale Entanglement Renormali…