Colin Rylands
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View article: A simpler probe of the quantum Mpemba effect in closed systems
A simpler probe of the quantum Mpemba effect in closed systems Open
We study the local relaxation of closed quantum systems through the relative entropy between the reduced density matrix and its long time limit. We show, using analytic arguments combined with numerical checks, that this relative entropy c…
View article: Quench dynamics of negativity Hamiltonians
Quench dynamics of negativity Hamiltonians Open
In this paper, we investigate the quench dynamics of the negativity and fermionic negativity Hamiltonians in free fermionic systems. We do this by generalizing a recently developed quasiparticle picture for the entanglement Hamiltonians to…
View article: Entanglement in dual unitary quantum circuits with impurities
Entanglement in dual unitary quantum circuits with impurities Open
Bipartite entanglement entropy is one of the most useful characterizations of universal properties in a many-body quantum system. Far from equilibrium, there exist two highly effective theories describing its dynamics -- the quasiparticle …
View article: Entanglement asymmetry in CFT with boundary symmetry breaking
Entanglement asymmetry in CFT with boundary symmetry breaking Open
A bstract We examine the behavior of the entanglement asymmetry in the ground state of a (1+1)-dimensional conformal field theory with a boundary condition that explicitly breaks a bulk symmetry. Our focus is on the asymmetry of a subsyste…
View article: Emergent boundary supersymmetry in a one dimensional superconductor
Emergent boundary supersymmetry in a one dimensional superconductor Open
The interplay between bulk properties and boundary conditions in one-dimensional quantum systems, gives rise to many intriguing phenomena. These include the emergence of zero energy modes which are of significant interest to a variety of f…
View article: Translation symmetry restoration under random unitary dynamics
Translation symmetry restoration under random unitary dynamics Open
The finite parts of a large, locally interacting many-body system prepared out of equilibrium eventually equilibrate. Characterizing the underlying mechanisms of this process and its timescales, however, is particularly hard as it requires…
View article: Quasiparticle picture for entanglement hamiltonians in higher dimensions
Quasiparticle picture for entanglement hamiltonians in higher dimensions Open
We employ the quasiparticle picture of entanglement evolution to obtain an effective description for the out-of-equilibrium entanglement Hamiltonian at the hydrodynamical scale following quantum quenches in free fermionic systems in two or…
View article: Dynamical symmetry restoration in the Heisenberg spin chain
Dynamical symmetry restoration in the Heisenberg spin chain Open
The entanglement asymmetry is an observable independent tool to investigate the relaxation of quantum many-body systems through the restoration of an initially broken symmetry of the dynamics. In this paper we use this to investigate the e…
View article: Quench dynamics of entanglement from crosscap states
Quench dynamics of entanglement from crosscap states Open
The linear growth of entanglement after a quench from a state with short-range correlations is a universal feature of many body dynamics. It has been shown to occur in integrable and chaotic systems undergoing either Hamiltonian, Floquet o…
View article: Quasiparticle Picture for Entanglement Hamiltonians in Higher Dimensions
Quasiparticle Picture for Entanglement Hamiltonians in Higher Dimensions Open
We employ the quasiparticle picture of entanglement evolution to obtain an effective description for the out-of-equilibrium Entanglement Hamiltonian at the hydrodynamical scale following quantum quenches in free fermionic systems in two or…
View article: Entanglement asymmetry in CFT with boundary symmetry breaking
Entanglement asymmetry in CFT with boundary symmetry breaking Open
We examine the behavior of the entanglement asymmetry in the ground state of a (1+1)-dimensional conformal field theory with a boundary condition that explicitly breaks a bulk symmetry. Our focus is on the asymmetry of a subsystem $A$ orig…
View article: Multiple crossings during dynamical symmetry restoration and implications for the quantum Mpemba effect
Multiple crossings during dynamical symmetry restoration and implications for the quantum Mpemba effect Open
Local relaxation after a quench in 1D quantum many-body systems is a well-known and very active problem with rich phenomenology. Except in pathological cases, the local relaxation is accompanied by the local restoration of the symmetries b…
View article: Entanglement Hamiltonians and the quasiparticle picture
Entanglement Hamiltonians and the quasiparticle picture Open
The entanglement Hamiltonian (EH) provides the most comprehensive characterization of bipartite entanglement in many-body quantum systems. Ground states of local Hamiltonians inherit this locality, resulting in EHs that are dominated by lo…
View article: Translation symmetry restoration under random unitary dynamics
Translation symmetry restoration under random unitary dynamics Open
The finite parts of a large, locally interacting many-body system prepared out-of-equilibrium eventually equilibrate. Characterising the underlying mechanisms of this process and its timescales, however, is particularly hard as it requires…
View article: Dynamics of charge fluctuations from asymmetric initial states
Dynamics of charge fluctuations from asymmetric initial states Open
Conserved-charge densities are very special observables in quantum many-body systems as, by construction, they encode information about the dynamics. Therefore, their evolution is expected to be of much simpler interpretation than that of …
View article: Path integral approach to quantum anomalies in interacting models
Path integral approach to quantum anomalies in interacting models Open
The prediction and subsequent discovery of topological semimetal phases of matter in solid state systems has instigated a surge of activity investigating the exotic properties of these unusual materials. Among these are transport signature…
View article: Full counting statistics of charge in quenched quantum gases
Full counting statistics of charge in quenched quantum gases Open
Unless constrained by symmetry, measurement of an observable on an ensemble of identical quantum systems returns a distribution of values which are encoded in the full counting statistics. While the mean value of this distribution is impor…
View article: Full Counting Statistics of Charge in Quenched Quantum Gases
Full Counting Statistics of Charge in Quenched Quantum Gases Open
Unless constrained by symmetry, measurement of an observable on an ensemble of identical quantum systems returns a distribution of values which are encoded in the full counting statistics. While the mean value of this distribution is impor…
View article: Microscopic origin of the quantum Mpemba effect in integrable systems
Microscopic origin of the quantum Mpemba effect in integrable systems Open
The highly complicated nature of far from equilibrium systems can lead to a complete breakdown of the physical intuition developed in equilibrium. A famous example of this is the Mpemba effect, which states that non-equilibrium states may …
View article: Nonequilibrium Full Counting Statistics and Symmetry-Resolved Entanglement from Space-Time Duality
Nonequilibrium Full Counting Statistics and Symmetry-Resolved Entanglement from Space-Time Duality Open
Owing to its probabilistic nature, a measurement process in quantum mechanics produces a distribution of possible outcomes. This distribution-or its Fourier transform known as full counting statistics (FCS)-contains much more information t…
View article: Charge-resolved entanglement in the presence of topological defects
Charge-resolved entanglement in the presence of topological defects Open
Topological excitations or defects such as solitons are ubiquitous throughout physics, supporting numerous interesting phenomena like zero energy modes with exotic statistics and fractionalized charges. In this paper, we study such objects…
View article: Dynamics of charge fluctuations from asymmetric initial states
Dynamics of charge fluctuations from asymmetric initial states Open
Conserved-charge densities are very special observables in quantum many-body systems as, by construction, they encode information about the dynamics. Therefore, their evolution is expected to be of much simpler interpretation than that of …
View article: Transport and entanglement across integrable impurities from Generalized Hydrodynamics
Transport and entanglement across integrable impurities from Generalized Hydrodynamics Open
Quantum impurity models (QIMs) are ubiquitous throughout physics. As simplified toy models they provide crucial insights for understanding more complicated strongly correlated systems, while in their own right are accurate descriptions of …
View article: On the path integral approach to quantum anomalies in interacting models
On the path integral approach to quantum anomalies in interacting models Open
The prediction and subsequent discovery of topological semimetal phases of matter in solid state systems has instigated a surge of activity investigating the exotic properties of these unusual materials. Amongst these are transport signatu…
View article: Nonequilibrium Full Counting Statistics and Symmetry-Resolved Entanglement from Space-Time Duality
Nonequilibrium Full Counting Statistics and Symmetry-Resolved Entanglement from Space-Time Duality Open
Due to its probabilistic nature, a measurement process in quantum mechanics produces a distribution of possible outcomes. This distribution - or its Fourier transform known as full counting statistics (FCS) - contains much more information…
View article: Integrable quenches in the Hubbard model
Integrable quenches in the Hubbard model Open
We study the quench dynamics of the one-dimensional Hubbard model through the quench action formalism. We introduce a class of integrable initial states—expressed as product states over two sites—for which we can provide an exact character…
View article: Solution of the BEC to BCS Quench in One Dimension
Solution of the BEC to BCS Quench in One Dimension Open
A gas of interacting fermions confined in a quasi one-dimensional geometry shows a BEC to BCS crossover upon slowly driving its coupling constant through a confinement-induced resonance. On one side of the crossover the fermions form tight…
View article: Rise and fall of Yu-Shiba-Rusinov bound states in charge-conserving <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>s</mml:mi></mml:math>-wave one-dimensional superconductors
Rise and fall of Yu-Shiba-Rusinov bound states in charge-conserving -wave one-dimensional superconductors Open
We re-examine the problem of a magnetic impurity coupled to a superconductor focusing on the role of quantum fluctuations. We study in detail, a system that consists of a one-dimensional charge conserving spin-singlet superconductor couple…
View article: Chiral Anomaly in Interacting Condensed Matter Systems
Chiral Anomaly in Interacting Condensed Matter Systems Open
The chiral anomaly is a fundamental quantum mechanical phenomenon which is of great importance to both particle physics and condensed matter physics alike. In the context of QED, it manifests as the breaking of chiral symmetry in the prese…