Adrian Chapman
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View article: Programmable digital quantum simulation of 2D Fermi-Hubbard dynamics using 72 superconducting qubits
Programmable digital quantum simulation of 2D Fermi-Hubbard dynamics using 72 superconducting qubits Open
Simulating the time-dynamics of quantum many-body systems was the original use of quantum computers proposed by Feynman, motivated by the critical role of quantum interactions between electrons in the properties of materials and molecules.…
View article: A graph-theoretic framework for free-parafermion solvability
A graph-theoretic framework for free-parafermion solvability Open
We present a graph-theoretic characterization of when a quantum spin model admits an exact solution via a mapping to free parafermions. Our characterization is based on the concept of a frustration graph, which represents the commutation r…
View article: Biased estimator channels for classical shadows
Biased estimator channels for classical shadows Open
Extracting classical information from quantum systems is of fundamental importance, and classical shadows allow us to extract a large amount of information using relatively few measurements. Conventional shadow estimators are unbiased and …
View article: A Graph-Theoretic Framework for Free-Parafermion Solvability
A Graph-Theoretic Framework for Free-Parafermion Solvability Open
We present a graph-theoretic characterisation of when a quantum spin model admits an exact solution via a mapping to free parafermions. Our characterisation is based on the concept of a frustration graph, which represents the commutation r…
View article: A Unified Graph-Theoretic Framework for Free-Fermion Solvability
A Unified Graph-Theoretic Framework for Free-Fermion Solvability Open
We show that a quantum spin system has an exact description by non-interacting fermions if its frustration graph is claw-free and contains a simplicial clique. The frustration graph of a spin model captures the pairwise anticommutation rel…
View article: Free-Fermion Subsystem Codes
Free-Fermion Subsystem Codes Open
We consider quantum error-correcting subsystem codes whose gauge generators realize a translation-invariant, free-fermion-solvable spin model. In this setting, errors are suppressed by a Hamiltonian whose terms are the gauge generators of …
View article: Free-Fermion Subsystem Codes
Free-Fermion Subsystem Codes Open
We consider quantum error-correcting subsystem codes whose gauge generators realize a translation-invariant, free-fermion-solvable spin model. In this setting, errors are suppressed by a Hamiltonian whose terms are the gauge generators of …
View article: Many-body-localization transition in a universal quantum circuit model
Many-body-localization transition in a universal quantum circuit model Open
The dynamical generation of complex correlations in quantum many-body systems is of renewed interest in the context of quantum chaos, where the out-of-time-ordered (OTO) correlation function appears as a convenient measure of scrambling. T…
View article: Classical simulation of quantum circuits by dynamical localization: Analytic results for Pauli-observable scrambling in time-dependent disorder
Classical simulation of quantum circuits by dynamical localization: Analytic results for Pauli-observable scrambling in time-dependent disorder Open
We extend the concept of Anderson localization, the confinement of quantum\ninformation in a spatially irregular potential, to quantum circuits.\nConsidering matchgate circuits, generated by time-dependent spin-1/2 XY\nHamiltonians, we giv…
View article: Localization and Scrambling of Quantum Information with Applications to Quantum Computation and Thermodynamics
Localization and Scrambling of Quantum Information with Applications to Quantum Computation and Thermodynamics Open
As our demand for computational power grows, we encounter the question: "What are the physical limits to computation?" An answer is necessarily incomplete unless it can incorporate physics at the smallest scales, where we expect our near-t…
View article: Toward Early-Warning Detection Of Gravitational Waves From Compact Binary Coalescence
Toward Early-Warning Detection Of Gravitational Waves From Compact Binary Coalescence Open
Rapid detection of compact binary coalescence (CBC) with a network of advanced gravitational-wave detectors will offer a unique opportunity for multi-messenger astronomy. Prompt detection alerts for the astronomical community might make it…
View article: How an autonomous quantum Maxwell demon can harness correlated information
How an autonomous quantum Maxwell demon can harness correlated information Open
We study an autonomous quantum system which exhibits refrigeration under an information-work trade-off like a Maxwell demon. The system becomes correlated as a single "demon" qubit interacts sequentially with memory qubits while in contact…