120 citations · 244 across the 10 of their papers we have counts for
10 papers
Transitions in the learnability of global charges from local measurements
Fergus Barratt, Utkarsh Agrawal, Andrew C. Potter +2
We consider monitored quantum systems with a global conserved charge, and ask how efficiently an observer ("eavesdropper") can learn the global charge of such systems from local pr…
Simulating groundstate and dynamical quantum phase transitions on a superconducting quantum computer
James Dborin, Vinul Wimalaweera, Fergus Barratt +3
We optimise a translationally invariant, sequential quantum circuit on a superconducting quantum device to simulate the groundstate of the quantum Ising model through its quantum c…
Deterministic Tensor Network Classifiers
L. Wright, F. Barratt, J. Dborin +3
We present tensor networks for feature extraction and refinement of classifier performance. These networks can be initialised deterministically and have the potential for implement…
Improvements to Gradient Descent Methods for Quantum Tensor Network Machine Learning
Fergus Barratt, James Dborin, Lewis Wright
Tensor networks have demonstrated significant value for machine learning in a myriad of different applications. However, optimizing tensor networks using standard gradient descent…
Field theory of charge sharpening in symmetric monitored quantum circuits
Fergus Barratt, Utkarsh Agrawal, Sarang Gopalakrishnan +3
Monitored quantum circuits (MRCs) exhibit a measurement-induced phase transition between area-law and volume-law entanglement scaling. MRCs with a conserved charge additionally exh…
Matrix Product State Pre-Training for Quantum Machine Learning
James Dborin, Fergus Barratt, Vinul Wimalaweera +2
Hybrid Quantum-Classical algorithms are a promising candidate for developing uses for NISQ devices. In particular, Parametrised Quantum Circuits (PQCs) paired with classical optimi…
Dissipative failure of adiabatic quantum transport as a dynamical phase transition
Fergus Barratt, Aleix Bou Comas, Philip J. D. Crowley +3
Entanglement is the central resource in adiabatic quantum transport. Dephasing affects the availability of that resource by biasing trajectories, driving transitions between succes…
Automatic Post-selection by Ancillae Thermalisation
Lewis Wright, Fergus Barratt, James Dborin +2
Tasks such as classification of data and determining the groundstate of a Hamiltonian cannot be carried out through purely unitary quantum evolution. Instead, the inherent non-unit…
Parallel Quantum Simulation of Large Systems on Small Quantum Computers
Fergus Barratt, James Dborin, Matthias Bal +3
Tensor networks permit computational and entanglement resources to be concentrated in interesting regions of Hilbert space. Implemented on NISQ machines they allow simulation of qu…
Rare quantum metastable states in the strongly dispersive Jaynes-Cummings oscillator
Th. K. Mavrogordatos, F. Barratt, U. Asari +3
We present evidence of metastable rare quantum-fluctuation switching for the driven dissipative Jaynes-Cummings oscillator coupled to a zero-temperature bath in the strongly disper…