712 citations · 1.5k across the 25 of their papers we have counts for
25 papers
Macromux: scalable postselection for high-threshold fault-tolerant quantum computation
Patrick Birchall, Jacob Bridgeman, Christopher Dawson +7
We introduce a new resource-efficient scheme for fault-tolerant quantum computation known as `macroscale multiplexing' (or simply `Macromux'), that utilizes scalable postselection…
Comparison of schemes for highly loss tolerant photonic fusion based quantum computing
Sara Bartolucci, Tom Bell, Hector Bombin +18
We summarize the performance of recently-proposed methods for achieving fault tolerant fusions-based quantum computation with high tolerance to qubit loss, specifically aimed at ph…
Tensor-network decoders for process tensor descriptions of non-Markovian noise
Fumiyoshi Kobayashi, Hidetaka Manabe, Gregory A. L. White +3
Quantum error correction (QEC) is essential for fault-tolerant quantum computation. Often in QEC errors are assumed to be independent and identically distributed and can be discret…
Fault-tolerant complexes
Hector Bombin, Chris Dawson, Terry Farrelly +5
Fault-tolerant complexes describe surface-code fault-tolerant protocols from a single geometric object. We first introduce fusion complexes that define a general family of fusion-b…
Optimization of Tensor Network Codes with Reinforcement Learning
Caroline Mauron, Terry Farrelly, Thomas M. Stace
Tensor network codes enable structured construction and manipulation of stabilizer codes out of small seed codes. Here, we apply reinforcement learning to tensor network code geome…
Local tensor-network codes
Terry Farrelly, David K. Tuckett, Thomas M. Stace
Tensor-network codes enable the construction of large stabilizer codes out of tensors describing smaller stabilizer codes. An application of tensor-network codes was an efficient a…
Parallel decoding of multiple logical qubits in tensor-network codes
Terry Farrelly, Robert J. Harris, Nathan A. McMahon +1
We consider tensor-network stabilizer codes and show that their tensor-network decoder has the property that independent logical qubits can be decoded in parallel. As long as the e…
Tensor-network codes
Terry Farrelly, Robert J. Harris, Nathan A. McMahon +1
Inspired by holographic codes and tensor-network decoders, we introduce tensor-network stabilizer codes which come with a natural tensor-network decoder. These codes can correspond…
Does causal dynamics imply local interactions?
Zoltán Zimborás, Terry Farrelly, Szilárd Farkas +1
We consider quantum systems with causal dynamics in discrete spacetimes, also known as quantum cellular automata (QCA). Due to time-discreteness this type of dynamics is not charac…
Discretizing quantum field theories for quantum simulation
Terry Farrelly, Julien Streich
To date, all proposed quantum algorithms for simulating quantum field theory (QFT) simulate (continuous-time) Hamiltonian lattice QFT as a stepping stone. Two overlooked issues are…
Uncertainty from Heisenberg to Today
Reinhard F. Werner, Terry Farrelly
We explore the different meanings of "quantum uncertainty" contained in Heisenberg's seminal paper from 1927, and also some of the precise definitions that were explored later. We…
A review of Quantum Cellular Automata
Terry Farrelly
Discretizing spacetime is often a natural step towards modelling physical systems. For quantum systems, if we also demand a strict bound on the speed of information propagation, we…
A quantum cellular automaton for one-dimensional QED
Pablo Arrighi, Cédric Bény, Terry Farrelly
We propose a discrete spacetime formulation of quantum electrodynamics in one-dimension (a.k.a the Schwinger model) in terms of quantum cellular automata, i.e. translationally inva…
Efficient Learning for Deep Quantum Neural Networks
Kerstin Beer, Dmytro Bondarenko, Terry Farrelly +3
Neural networks enjoy widespread success in both research and industry and, with the imminent advent of quantum technology, it is now a crucial challenge to design quantum neural n…
Equilibration towards generalized Gibbs ensembles in non-interacting theories
Marek Gluza, Jens Eisert, Terry Farrelly
Even after almost a century, the foundations of quantum statistical mechanics are still not completely understood. In this work, we provide a precise account on these foundations f…
Discrete-time quantum walks as fermions of lattice gauge theory
Pablo Arnault, Armando Pérez, Pablo Arrighi +1
It is shown that discrete-time quantum walks can be used to digitize, i.e., to time discretize fermionic models of continuous-time lattice gauge theory. The resulting discrete-time…
Energy cost of entanglement extraction in complex quantum systems
Cedric Beny, Christopher T. Chubb, Terry Farrelly +1
What is the energy cost of extracting entanglement from complex quantum systems? In other words, given a state of a quantum system, how much energy does it cost to extract m EPR pa…
Insights from Quantum Information into Fundamental Physics
Terry Farrelly
This thesis is split into two parts, which are united in the sense that they involve applying ideas from quantum information to fundamental physics. The first part is focused on ex…
Thermalization and Return to Equilibrium on Finite Quantum Lattice Systems
Terry Farrelly, Fernando G. S. L. Brandao, Marcus Cramer
Thermal states are the bedrock of statistical physics. Nevertheless, when and how they actually arise in closed quantum systems is not fully understood. We consider this question f…
Comparing classical and quantum equilibration
Artur S. L. Malabarba, Terry Farrelly, Anthony J. Short
By using a physically-relevant and theory independent definition of measurement-based equilibration, we show quantitatively that equilibration is easier for quantum systems than fo…
Equilibration of Quantum Gases
Terry Farrelly
Finding equilibration times is a major unsolved problem in physics with few analytical results. Here we look at equilibration times for quantum gases of bosons and fermions in the…
Quantum Systems Equilibrate Rapidly for Most Observables
Artur S. L. Malabarba, Luis Pedro García-Pintos, Noah Linden +2
Considering any Hamiltonian, any initial state, and measurements with a small number of possible outcomes compared to the dimension, we show that most measurements are already equi…
Discrete Spacetime and Relativistic Quantum Particles
Terence C. Farrelly, Anthony J. Short
We study a single quantum particle in discrete spacetime evolving in a causal way. We see that in the continuum limit any massless particle with a two dimensional internal degree o…
Causal Fermions in Discrete Spacetime
Terence C. Farrelly, Anthony J. Short
In this paper, we consider fermionic systems in discrete spacetime evolving with a strict notion of causality, meaning they evolve unitarily and with a bounded propagation speed. F…