19 citations
6 papers
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…
Computing the Photometric and Polarimetric Variability of Be Stars
Keegan C. Marr, C. E. Jones, R. J. Halonen
We investigate variations in the linear polarization as well as in the V-band and B-band colour-magnitudes for classical Be star disks. We present two models: disks with enhanced d…
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…
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…
From Twisted Quantum Loop Algebras to Twisted Yangians
Patrick Conner, Nicolas Guay
We prove how the Yangian of in its RTT presentation and Olshanski's twisted Yangians for the orthogonal and symplectic Lie algebras can be obtained by a degenerat…