title: Bounds on the speed of information propagation in disordered quantum spin chains.
abstract: We investigate the propagation of information through the disordered XY model. We find that all correlations, both classical and quantum, are exponentially suppressed outside of an effective light cone whose radius grows at most logarithmically with |t|.
authors.affiliation: Department of Mathematics, Royal Holloway University of London, Egham, Surrey, TW20 0EX, United Kingdom.
authors.forename: Christian K
authors.initials: CK
authors.lastname: Burrell
authors.forename: Tobias J
authors.initials: TJ
authors.lastname: Osborne