Browsing Physics (Scholarly Publications) by Author "Goold, John"
Now showing items 1-20 of 25
-
Analysis of the conditional mutual information in ballistic and diffusive non-equilibrium steady-states
Goold, John (2020)The conditional mutual information (CMI) ℐ(A:C|B) quantifies the amount of correlations shared between A and C given B. It therefore functions as a more general quantifier of bipartite correlations in multipartite scenarios, ... -
Asymmetry in energy versus spin transport in certain interacting disordered systems
Goold, John (2019)We study energy transport in disordered XXZ spin-1/2 chains driven to nonequilibrium configurations by thermal reservoirs of different temperatures at the boundaries, using large-scale matrix product simulations. In ... -
Ballistic vs diffusive low-frequency scaling in the XXZ and a locally perturbed XXZ chain
Goold, John (2020)We study the matrix elements of local operators in the eigenstates of the integrable XXZ chain and of the quantum-chaotic model obtained by locally perturbing the XXZ chain with a magnetic impurity. We show that, at ... -
Daemonic ergotropy: Enhanced work extraction from quantum correlations
Goold, John (2017)We investigate how the presence of quantum correlations can influence work extraction in closed quantum systems, establishing a new link between the field of quantum non-equilibrium thermodynamics and the one of quantum ... -
Eigenstate Thermalisation in a Locally Perturbed Integrable System
Goold, John (2020)Eigenstate thermalization is widely accepted as the mechanism behind thermalization in generic isolated quantum systems. Using the example of a single magnetic defect embedded in the integrable spin-1/2 XXZ chain, we show ... -
Energy Current Rectification and Mobility Edges
Goold, John (2019)We investigate how the presence of a single-particle mobility edge in a system can generate strong energy current rectification. Specifically, we study a quadratic bosonic chain subject to a quasiperiodic potential and ... -
High-temperature coherent transport in the XXZ chain in the presence of an impurity
Goold, John (2018)We study high-temperature spin transport through an anisotropic spin-12 Heisenberg chain in which integrability is broken by a single impurity close to the center of the chain. For a finite impurity strength, the level ... -
In Situ Thermometry of a Cold Fermi Gas via Dephasing Impurities
Goold, John (2020)The precise measurement of low temperatures is a challenging, important, and fundamental task for quantum science. In particular, in situ thermometry is highly desirable for cold atomic systems due to their potential for ... -
Logarithmic growth of local entropy and total correlations in many-body localized dynamics
Goold, John; Pietracaprina, Francesca (2020)The characterizing feature of a many-body localized phase is the existence of an extensive set of quasi-local conserved quantities with an exponentially localized support. This structure endows the system with the signature ... -
Low-frequency behavior of off-diagonal matrix elements in the integrable XXZ chain and in a locally perturbed quantum-chaotic XXZ chain
Goold, John (2020)We study the matrix elements of local operators in the eigenstates of the integrable XXZ chain and of the quantum-chaotic model obtained by locally perturbing the XXZ chain with a magnetic impurity. We show that, at ... -
Multipartite entanglement in the Eigenstate Thermalisation Hypothesis
Goold, John (2020)We study the quantum Fisher information (QFI) and, thus, the multipartite entanglement structure of thermal pure states in the context of the eigenstate thermalization hypothesis (ETH). In both the canonical ensemble and ... -
Non-destructive in-situ thermometry of a cold gas via rephrasing impurities
Goold, John; Mitchison, Mark (2020)The precise measurement of low temperatures is a challenging, important and fundamental task for quantum science. In particular, non-destructive in-situ thermometry is highly desirable for cold atomic systems due to their ... -
Nonreciprocal quantum transport at junctions of structured leads
Goold, John (2019)We propose and analyze a mechanism for rectification of spin transport through a small junction between two spin baths or leads. For interacting baths, we show that transport is conditioned on the spacial asymmetry of the ... -
Out of equilibrium thermodynamics of quantum harmonic chains
Goold, John (2019)The thermodynamic implications for the out-of-equilibrium dynamics of quantum systems are to date largely unexplored, especially for quantum many-body systems. In this paper we investigate the paradigmatic case of an array ... -
Quantum coherence and ergotropy
Goold, John; Mitchison, Mark; Binder, Felix (2020)Constraints on work extraction are fundamental to our operational understanding of the thermodynamics of both classical and quantum systems. In the quantum setting, finite-time control operations typically generate coherence ... -
Quantum heat statistics with time-evolving matrix product operators
Eastham, Paul; Mitchison, Mark T.; Popovic, Maria; Goold, John (2021)We present a numerically exact method to compute the full counting statistics of heat transfer in non-Markovian open quantum systems, which is based on the time-evolving matrix product operator algorithm. This approach is ... -
Quantum work statistics and resource theories: Bridging the gap through Rényi divergences
Goold, John (2019)The work performed on or extracted from a nonautonomous quantum system described by means of a two-point projective-measurement approach is a stochastic variable. We show that the cumulant generating function of work can ... -
Quasiperiodic quantum heat engines with a mobility edge
Goold, John; Purkayastha, Archak; Mitchison, Mark (2020)Steady-state thermoelectric machines convert heat into work by driving a thermally generated charge current against a voltage gradient. In this work, we propose a new class of steady-state heat engines operating in the ... -
Role of coherence in the nonequilibrium thermodynamics of quantum systems
Goold, John (2019)Exploiting the relative entropy of coherence, we isolate the coherent contribution in the energetics of a driven nonequilibrium quantum system. We prove that a division of the irreversible work can be made into a coherent ... -
The Role of Quantum Work Statistics in Many-Body Physics
Goold, John (2018)In this contribution, we aim to illustrate how quantum work statistics can be used as a tool in order to gain insight on the universal features of non-equilibrium many-body systems. Focusing on the two-point measurement ...