522 citations · 3.4k across the 56 of their papers we have counts for
56 papers
Eliminating radiative losses in long-range exciton transport
Scott Davidson, Felix A. Pollock, Erik M. Gauger
We demonstrate that it is possible to effectively eliminate radiative losses during excitonic energy transport in systems with an intrinsic energy gradient. By considering chain-li…
Equilibration of Multitime Quantum Processes in Finite Time Intervals
Neil Dowling, Pedro Figueroa-Romero, Felix A. Pollock +2
A generic non-integrable (unitary) out-of-equilibrium quantum process, when interrogated across many times, is shown to yield the same statistics as an (non-unitary) equilibrated p…
Reduced Dynamics of Full Counting Statistics
Felix A. Pollock, Emanuel Gull, K. Modi +1
We present a theory of modified reduced dynamics in the presence of counting fields. Reduced dynamics techniques are useful for describing open quantum systems at long emergent tim…
Extracting Quantum Dynamical Resources: Consumption of Non-Markovianity for Noise Reduction
Graeme D. Berk, Simon Milz, Felix A. Pollock +1
Noise is possibly the most formidable challenge for quantum technologies. As such, a great deal of effort is dedicated to developing methods for noise reduction. One remarkable ach…
Relaxation of Multitime Statistics in Quantum Systems
Neil Dowling, Pedro Figueroa-Romero, Felix A. Pollock +2
Equilibrium statistical mechanics provides powerful tools to understand physics at the macroscale. Yet, the question remains how this can be justified based on a microscopic quantu…
What can unitary sequences tell us about multi-time physics?
Gregory A. L. White, Felix A. Pollock, Lloyd C. L. Hollenberg +2
Multi-time quantum processes are endowed with the same richness as multipartite states, including temporal entanglement and exotic causal structures. However, experimentally probin…
Memory in quantum dot blinking
Roberto N. Munoz, Laszlo Frazer, Gangcheng Yuan +3
The photoluminescence intermittency (blinking) of quantum dots is interesting because it is an easily-measured quantum process whose transition statistics cannot be explained by Fe…
Non-Markovian Quantum Process Tomography
Gregory A. L. White, Felix A. Pollock, Lloyd C. L. Hollenberg +2
Characterisation protocols have so far played a central role in the development of noisy intermediate-scale quantum (NISQ) computers capable of impressive quantum feats. This traje…
Signatures of quantum chaos in an out-of-time-order tensor
Magdalini Zonnios, Jesper Levinsen, Meera M. Parish +2
Motivated by the famous ink-drop experiment, where ink droplets are used to determine the chaoticity of a fluid, we propose an experimentally implementable method for measuring the…
Genuine Multipartite Entanglement in Time
Simon Milz, Cornelia Spee, Zhen-Peng Xu +3
While spatial quantum correlations have been studied in great detail, much less is known about the genuine quantum correlations that can be exhibited by temporal processes. Employi…
Quantum chicken-egg dilemmas: Delayed-choice causal order and the reality of causal non-separability
Simon Milz, Dominic Jurkschat, Felix A. Pollock +1
Recent frameworks describing quantum mechanics in the absence of a global causal order admit the existence of causally indefinite processes, where it is impossible to ascribe causa…
The dark side of energy transport along excitonic wires: On-site energy barriers facilitate efficient, vibrationally-mediated transport through optically dark subspaces
Scott Davidson, Amir Fruchtman, Felix Pollock +1
We present a novel, counter-intuitive method, based on dark state protection, for significantly improving exciton transport efficiency through `wires' comprising a chain of molecul…
A discrete memory-kernel for multi-time correlations in non-Markovian quantum processes
Mathias R. Jørgensen, Felix A. Pollock
Efficient simulations of the dynamics of open systems is of wide importance for quantum science and tech-nology. Here, we introduce a generalization of the transfer-tensor, or disc…
Resource speed limits: Maximal rate of resource variation
Francesco Campaioli, Chang-shui Yu, Felix A. Pollock +1
Recent advances in quantum resource theories have been driven by the fact that many quantum information protocols make use of different facets of the same physical features, e.g. e…
Principles underlying efficient exciton transport unveiled by information-geometric analysis
Scott Davidson, Felix A. Pollock, Erik M. Gauger
Adapting techniques from the field of information geometry, we show that open quantum system models of Frenkel exciton transport, a prevalent process in photosynthetic networks, be…
Demonstration of non-Markovian process characterisation and control on a quantum processor
Gregory A. L. White, Charles D. Hill, Felix A. Pollock +2
In the scale-up of quantum computers, the framework underpinning fault-tolerance generally relies on the strong assumption that environmental noise affecting qubit logic is uncorre…
Markovianization with approximate unitary designs
Pedro Figueroa-Romero, Felix A. Pollock, Kavan Modi
Memoryless processes are ubiquitous in nature, in contrast with the mathematics of open systems theory, which states that non-Markovian processes should be the norm. This discrepan…
A Technical Critique of Some Parts of the Free Energy Principle
Martin Biehl, Felix A. Pollock, Ryota Kanai
We summarize the original formulation of the free energy principle, and highlight some technical issues. We discuss how these issues affect related results involving generalised co…
Non-Markovian Memory Strength Bounds Quantum Process Recoverability
Philip Taranto, Felix A. Pollock, Kavan Modi
Generic non-Markovian quantum processes have infinitely long memory, implying an exact description that grows exponentially in complexity with observation time. Here, we present a…
Resource theories of multi-time processes: A window into quantum non-Markovianity
Graeme D. Berk, Andrew J. P. Garner, Benjamin Yadin +2
We investigate the conditions under which an uncontrollable background processes may be harnessed by an agent to perform a task that would otherwise be impossible within their oper…
An algorithm for solving unconstrained unitary quantum brachistochrone problems
Francesco Campaioli, William Sloan, Kavan Modi +1
We introduce an iterative method to search for time-optimal Hamiltonians that drive a quantum system between two arbitrary, and in general mixed, quantum states. The method is base…
General anesthesia reduces complexity and temporal asymmetry of the informational structures derived from neural recordings in Drosophila
Roberto N. Muñoz, Angus Leung, Aidan Zecevik +5
We apply techniques from the field of computational mechanics to evaluate the statistical complexity of neural recording data from fruit flies. First, we connect statistical comple…
Equilibration on average in quantum processes with finite temporal resolution
Pedro Figueroa-Romero, Kavan Modi, Felix A. Pollock
We characterize the conditions under which a multi-time quantum process with a finite temporal resolution can be approximately described by an equilibrium one. By providing a gener…
Non-Markovian memory in IBMQX4
Joshua Morris, Felix A. Pollock, Kavan Modi
We measure and quantify non-Markovian effects in IBM's Quantum Experience. Specifically, we analyze the temporal correlations in a sequence of gates by characterizing the performan…