25 citations · 161 across the 17 of their papers we have counts for
17 papers
Universal scaling of quantum caustics in the dynamics of interacting particles
Monalisa Singh Roy, Jesse Mumford, D. H. J. O'Dell +1
Recent theoretical studies have predicted the existence of caustics in many-body quantum dynamics, where they manifest as extended regions of enhanced probability density that obey…
Topologically protected Bell-cat states in a simple spin model
B. Lajci, D. H. J. O'Dell, J. Mumford
We consider the topological properties of the so-called central spin model that consists of identical spins coupled to a single distinguishable central spin which arises in phy…
Gauge potentials and vortices in the Fock space of a pair of periodically driven Bose-Einstein condensates
J. Mumford, D. Kamp, D. H. J. O'Dell
We perform a theoretical study of the coupled dynamics of two species of Bose-Einstein condensates (BECs) in a double well potential where both the tunneling and the interatomic in…
Many topological regions on the Bloch sphere of the spin-1/2 double kicked top
J. Mumford
Floquet topological systems have been shown to exhibit features not commonly found in conventional topological systems such as topological phases characterized by arbitrarily large…
Two-particle topological Thouless spin pump
J. Mumford
We show that two particles interacting via spin exchange exhibit topological features found in one-dimensional single particle lattice models. This is accomplished by absorbing all…
Meissner effect in Fock space
J. Mumford
By periodically driving a single bosonic Josephson junction (BJJ) with an impurity, a synthetic gauge field is generated in the Fock space of the system. At a critical synthetic ga…
Synthetic gauge field in two interacting ultracold atomic gases without an optical lattice
J. Mumford
A 2D Fock-state lattice (FSL is constructed from the many-body states of two interacting two-mode quantum gases. By periodically driving the interspecies interactions and pulsing t…
False signals of chaos from quantum probes
W. Kirkby, D. H. J. O'Dell, J. Mumford
We demonstrate that two-time correlation functions, which are generalizations of out-of-time-ordered correlators (OTOCs), can show 'false-flags' of chaos by exhibiting behaviour pr…
Measuring out-of-time-ordered correlation functions with a single impurity qubit in a bosonic Josephson junction
J. Mumford, W. Kirkby, D. H. J. O'Dell
We calculate the out-of-time-ordered correlation function (OTOC) of a single impurity qubit coupled to fully a connected many-particle system such as a bosonic Josephson junction o…
Quantum caustics and the hierarchy of light cones in quenched spin chains
W. Kirkby, J. Mumford, D. H. J. O'Dell
We show that the light cone-like structures that form in spin chains after a quench are quantum caustics. Their natural description is in terms of catastrophe theory and this impli…
Quantum spin dynamics in Fock space following quenches: Caustics and vortices
J. Mumford, E. Turner, D. W. L. Sprung +1
Caustics occur widely in dynamics and take on shapes classified by catastrophe theory. At finite wavelengths they produce interference patterns containing networks of vortices (pha…
Emergence of singularities from decoherence: Quantum catastrophes
Aaron Z. Goldberg, Asma Al-Qasimi, J. Mumford +1
We use a master equation to study the dynamics of two coupled macroscopic quantum systems (e.g.\ a Josephson junction made of two Bose-Einstein condensates or two spin states of an…
Catastrophes in non-equilibrium many-particle wave functions: universality and critical scaling
J Mumford, W Kirkby, D H J O'Dell
As part of the quest to uncover universal features of quantum dynamics, we study catastrophes that form in simple many-body wave functions after a quench, focusing on two-mode syst…
Critical exponents for an impurity in a bosonic Josephson junction: Position measurement as a phase transition
J. Mumford, D. H. J. O'Dell
We use fidelity susceptibility to calculate quantum critical scaling exponents for a system consisting of identical bosons interacting with a single impurity atom in a double w…
Dicke-type phase transition in a multimode optomechanical system
Jesse Mumford, D. H. J. O'Dell, Jonas Larson
We consider the "membrane in the middle" optomechanical model consisting of a laser pumped cavity which is divided in two by a flexible membrane that is partially transmissive to l…
Impurity in a bosonic Josephson junction: swallowtail loops, chaos, self-trapping and the poor man's Dicke model
Jesse Mumford, Jonas Larson, D. H. J. O'Dell
We study a model describing identical bosonic atoms trapped in a double-well potential together with a single impurity atom, comparing and contrasting it throughout with the Di…
Impurity in a Bose-Einstein condensate in a double well
F. Mulansky, J. Mumford, D. H. J. O'Dell
We compare and contrast the mean-field and many-body properties of a Bose-Einstein condensate trapped in a double well potential with a single impurity atom. The mean-field solutio…