584 citations · 3.2k across the 67 of their papers we have counts for
67 papers
Synchronization in a dissipative quantum many-body system
B. Çakmak, K. Sümer, S. Campbell +1
We study synchronization in the XX qubit chain subject to local or multi-local amplitude-damping noise. Analyzing the decoherence-free subspace (DFS) structure of the model, we sho…
Universally Robust Quantum Control
Pablo M. Poggi, Gabriele De Chiara, Steve Campbell +1
We study the robustness of the evolution of a quantum system against small uncontrolled variations in parameters in the Hamiltonian. We show that the fidelity susceptibility, which…
First Passage Times for Continuous Quantum Measurement Currents
Michael J. Kewming, Anthony Kiely, Steve Campbell +1
The First Passage Time (FPT) is the time taken for a stochastic process to reach a desired threshold. In this letter we address the FPT of the stochastic measurement current in the…
Robustness of controlled Hamiltonian approaches to unitary quantum gates
Eoin Carolan, Barış Çakmak, Steve Campbell
We examine the effectiveness and resilience of achieving quantum gates employing three approaches stemming from quantum control methods: counterdiabatic driving, Floquet engineerin…
Thermometry of Strongly Correlated Fermionic Quantum Systems using Impurity Probes
George Mihailescu, Steve Campbell, Andrew K. Mitchell
We study quantum impurity models as a platform for quantum thermometry. A single quantum spin-1/2 impurity is coupled to an explicit, structured, fermionic thermal environment whic…
Entropy of the quantum work distribution
Anthony Kiely, Eoin O'Connor, Thomás Fogarty +2
The statistics of work done on a quantum system can be quantified by the two-point measurement scheme. We show how the Shannon entropy of the work distribution admits a general upp…
DQC1 as an Open Quantum System
Jake Xuereb, Steve Campbell, John Goold +1
The DQC1 complexity class, or power of one qubit model, is examined as an open quantum system. We study the dynamics of a register of qubits carrying out a DQC1 algorithm and show…
Minimal action control method in quantum critical models
Ainur Kazhybekova, Steve Campbell, Anthony Kiely
We present a general protocol to control closed quantum systems that is based on minimising the adiabatic action. Using tools based on the geometry of quantum evolutions through th…
Non-Gaussian work statistics at finite-time driving
Krissia Zawadzki, Anthony Kiely, Gabriel T. Landi +1
We study properties of the work distribution of a many-body system driven through a quantum phase transition in finite time. We focus on the non-Gaussianity of the distribution, wh…
Commutativity and the emergence of classical objectivity
Eoghan Ryan, Eoin Carolan, Steve Campbell +1
We examine how the ability of a system to redundantly proliferate relevant information about its pointer states is affected when it is coupled to multiple baths. To this end, we co…
Classical dissipative cost of quantum control
Anthony Kiely, Steve Campbell, Gabriel T. Landi
Protocols for non-adiabatic quantum control often require the use of classical time varying fields. Assessing the thermodynamic cost of such protocols, however, is far from trivial…
Periodically refreshed quantum thermal machines
Archak Purkayastha, Giacomo Guarnieri, Steve Campbell +2
We introduce unique class of cyclic quantum thermal machines (QTMs) which can maximize their performance at the finite value of cycle duration where they are most irreversible.…
Correlations, information backflow, and objectivity in a class of pure dephasing models
Nina Megier, Andrea Smirne, Steve Campbell +1
We critically examine the role that correlations established between a system and fragments of its environment play in characterising the ensuing dynamics. We employ a class of dep…
Optimal Control in Disordered Quantum Systems
Luuk Coopmans, Steve Campbell, Gabriele De Chiara +1
We investigate several control strategies for the transport of an excitation along a spin chain. We demonstrate that fast, high fidelity transport can be achieved using protocols d…
Stochastic collisional quantum thermometry
Eoin O'Connor, Bassano Vacchini, Steve Campbell
We extend collisional quantum thermometry schemes to allow for stochasticity in the waiting time between successive collisions. We establish that introducing randomness through a s…
Deep Learning for Principal-Agent Mean Field Games
Steven Campbell, Yichao Chen, Arvind Shrivats +1
Here, we develop a deep learning algorithm for solving Principal-Agent (PA) mean field games with market-clearing conditions -- a class of problems that have thus far not been stud…
Counterdiabatic control in the impulse regime
Eoin Carolan, Anthony Kiely, Steve Campbell
Coherent control of complex many-body systems is critical to the development of useful quantum devices. Fast perfect state transfer can be exactly achieved through additional count…
Diverging quantum speed limits: a herald of classicality
Pablo M. Poggi, Steve Campbell, Sebastian Deffner
When is the quantum speed limit (QSL) really quantum? While vanishing QSL times often indicate emergent classical behavior, it is still not entirely understood what precise aspects…
Quantum Darwinism in a composite system: Objectivity versus classicality
Barış Çakmak, Özgür E. Müstecaplıoğlu, Mauro Paternostro +2
We investigate the implications of quantum Darwinism in a composite quantum system with interacting constituents exhibiting a decoherence-free subspace. We consider a two-qubit sys…
Collision models in open system dynamics: A versatile tool for deeper insights?
Steve Campbell, Bassano Vacchini
Understanding and simulating how a quantum system interacts and exchanges information or energy with its surroundings is a ubiquitous problem, one which must be carefully addressed…
Fast and robust magnon transport in a spin chain
Anthony Kiely, Steve Campbell
A protocol for fast and robust magnon transport in a one-dimensional spin chain is devised. Employing an approximate mapping between the chain and a single harmonically trapped par…
Work statistics and symmetry breaking in an excited state quantum phase transition
Zakaria Mzaouali, Ricardo Puebla, John Goold +2
We examine how the presence of an excited state quantum phase transition manifests in the dynamics of a many-body system subject to a sudden quench. Focusing on the Lipkin-Meshkov-…
Periodically refreshed baths to simulate open quantum many-body dynamics
Archak Purkayastha, Giacomo Guarnieri, Steve Campbell +2
Obtaining dynamics of an interacting quantum many-body system connected to multiple baths initially at different, finite, temperatures and chemical potentials is a challenging prob…
Quantum Darwinism in a structured spin environment
Eoghan Ryan, Mauro Paternostro, Steve Campbell
We examine the emergence and suppression of signatures of quantum Darwinism when the system of interest interacts with a complex, structured environment. We introduce an extended s…